Mẹ làm cho bánh mì nướng ngon trong một chảo nhỏ . Sau khi nướng một slide của một lát , cô quay nó qua. Mỗi bên có 30 giây . Chảo chỉ có thể giữ hai lát . làm thế nào cô có thể nướng cả hai mặt của ba lát trong 3/2 thay vì 2 phút ?
Mother makes tasty toast in a small pan. After toasting one slide of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices. how can she toast both sides of three slices in 3/2 instead of 2 minutes ?
It takes 5 minutes to fry a pancake. One side of the pancake takes 3 minutes to fry and the other side takes only 2 minutes. Two pancakes can be placed on the frying pan at a time. What is the shortest time to fry all five pancakes???
sson 1. Lan in the apartment number? Lan house is in an 8 storey house, each floor has 8 apartments. One day, the class asked Lan: "What is your house in the apartment?" "Ask me some questions, I will answer all your questions, but just say" yes "or" no. "Through these questions you try to figure out how many in the apartment" Huy said: "I will ask, are you in the apartment number 1, number 2, ..., No. 63. So with most 63 questions you will know which apartment you. You say, "I only need 14 questions, 7 sentences enough to know what floor you are on and 7 you can know exactly what you are in the apartment." Dear children, I have to ask several times to know. How are you Lan in the apartment?
Lesson 2. Game together across the bridge. Four people need to cross a bridge. Because of the weak demand, each time we go not more than two people, and because it is dark, we have to take the light. Four people walk differently, crossing the bridge with corresponding time of 10 minutes, 5 minutes, 2 minutes and 1 minute. Since there is only one lamp, each passage must be carried back to the next person. When two people go together, cross the bridge with a slower time. The following example is a way to go: - 10 minutes to go with people 5 minutes to bridge, 10 minutes to take. - 5 minutes to take the lamp back, take 5 minutes. - 5 minutes to go with people 2 minutes through the bridge, It takes 5 minutes. - 2 minutes to take the lamp back, take 2 minutes. - 2 minutes with people 1 minute over the bridge, take 2 minutes. Total time is 10 + 5 + 5 + 2 + 2 = 24 minutes. Let's try to get away with a little less time as possible, and if less than 19 minutes is great
Lesson 3. Cashmere. Mallard buys 27 apples that are identical in size and volume. However, the salesman said that of the apples on the right is a slightly lighter weight. You use a table scales on both sides to find the apple that light. The minimum number of weighs required. Let's help you find that little apple. If they find that fruit after less than 5 weightings, then it is good.
How fast is Anna going if she runs 8 miles in the park in only 2 hours?
Answer: mile/hour.
Question 2
How far will Mary travel if she rides her motorbike for 24 minutes at a speed of 75 miles/hour?
Answer: miles.
Question 3:
Yesterday Peter roller skated for 2.5 hours at a speed of 6 km/h. How many kilometers did he skate?
Answer: km.
Question 4:
How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?
Answer: miles/hour.
Question 5
The area of a rectangle ABCD is . Given a random point E inside of ABCD.Find the total area of triangles AED and BEC.
Answer:
Question 6:
The distance between 2 trees is 300 meters. It will take a bird 30 seconds to fly between these 2 trees. How fast is the bird in kilometer per hour?
Answer: km/h.
0.6 hour = minutes.
Question 2:
51 hours = days
(Write your answer by decimal in the simplest form)
Question 3:
12 hours 24 minutes 2 = hours.
(Write your answer by decimal in the simplest form)
Question 4:
5 minutes 27 seconds: 3 = seconds.
Question 5:
How far will Mary travel if she rides her motorbike for 24 minutes at a speed of 75 miles/hour?
Answer: miles.
Question 6:
How fast is Anna going if she runs 8 miles in the park in only 2 hours?
Answer: mile/hour.
Question 7:
How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?
Answer: miles/hour.
Question 8:
Yesterday Peter roller skated for 2.5 hours at a speed of 6 km/h. How many kilometers did he skate?
Answer: km.
Question 9:
The distance between 2 trees is 300 meters. It will take a bird 30 seconds to fly between these 2 trees. How fast is the bird in kilometer per hour?
Answer: km/h.
Question 10:
The area of a rectangle ABCD is . Given a random point E inside of ABCD.Find the total area of triangles AED and BEC.
Answer:
Question 1:
51 hours = days
(Write your answer by decimal in the simplest form)
Question 2:
5 minutes 27 seconds: 3 = seconds.
Question 3:
12 hours 24 minutes 2 = hours.
(Write your answer by decimal in the simplest form)
Question 4:
0.6 hour = minutes.
Question 5:
How fast is Anna going if she runs 8 miles in the park in only 2 hours?
Answer: mile/hour.
Question 6:
Yesterday Peter roller skated for 2.5 hours at a speed of 6 km/h. How many kilometers did he skate?
Answer: km.
Question 7:
How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?
Answer: miles/hour.
Question 8:
How far will Mary travel if she rides her motorbike for 24 minutes at a speed of 75 miles/hour?
Answer: miles.
Question 9:
The area of a rectangle ABCD is . Given a random point E inside of ABCD.Find the total area of triangles AED and BEC.
Answer:
Question 10:
The distance between 2 trees is 300 meters. It will take a bird 30 seconds to fly between these 2 trees. How fast is the bird in kilometer per hour?
Answer: km/h.
Question 1:
5 minutes 27 seconds: 3 = seconds.
Question 2:
51 hours = days
(Write your answer by decimal in the simplest form)
Question 3:
12 hours 24 minutes 2 = hours.
(Write your answer by decimal in the simplest form)
Question 4:
0.6 hour = minutes.
Question 5:
How far will Mary travel if she rides her motorbike for 24 minutes at a speed of 75 miles/hour?
Answer: miles.
Question 6:
How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?
Answer: miles/hour.
Question 7:
Yesterday Peter roller skated for 2.5 hours at a speed of 6 km/h. How many kilometers did he skate?
Answer: km.
Question 8:
How fast is Anna going if she runs 8 miles in the park in only 2 hours?
Answer: mile/hour.
Question 9:
The area of a rectangle ABCD is . Given a random point E inside of ABCD.Find the total area of triangles AED and BEC.
Answer:
Question 10:
The distance between 2 trees is 300 meters. It will take a bird 30 seconds to fly between these 2 trees. How fast is the bird in kilometer per hour?
Answer: km/h.
Question 1:
5 minutes 27 seconds: 3 = seconds.
Question 2:
51 hours = days
(Write your answer by decimal in the simplest form)
Question 3:
12 hours 24 minutes 2 = hours.
(Write your answer by decimal in the simplest form)
Question 4:
0.6 hour = minutes.
Question 5:
How far will Mary travel if she rides her motorbike for 24 minutes at a speed of 75 miles/hour?
Answer: miles.
Question 6:
How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?
Answer: miles/hour.
Question 7:
Yesterday Peter roller skated for 2.5 hours at a speed of 6 km/h. How many kilometers did he skate?
Answer: km.
Question 8:
How fast is Anna going if she runs 8 miles in the park in only 2 hours?
Answer: mile/hour.
Question 9:
The distance between 2 trees is 300 meters. It will take a bird 30 seconds to fly between these 2 trees. How fast is the bird in kilometer per hour?
Answer: km/h.
Question 10:
The area of a rectangle ABCD is . Given a random point E inside of ABCD.Find the total area of triangles AED and BEC.
Answer:
A is playing the game. He flips the coin, and if it lands on heads, he gets 1 point. If it lands on tails, he gets 2 points. A does this thing many times. THE GOAL IS TO GET 14012010 POINTS. Note that the coin can land on side, but it HAPPENS ONCE 6000 FLIPS. But A can let the coin LANDS ON SIDE ONES EVERY 2010 FLIPS. If this happens, he will get 5 points.What is the maximum number of flips that A need to achieve the goal? ( About 3/4 of the time the coin lands on tails. )
BONUS:IF A TAKES 10 SECONDS FOR A FLIP, HOW MUCH TIME HE NEED TO ACHIEVE HIS GOAL?
