16 sparrows were resting on 2 lamp post

2 sparrow flew from the first to the second lamp post

3 sparrows flew from the second to the first lamp posts .

The number of sparrows on the first and the second lamp posts became the same.

How many sparrows on each lamp post at first.

giúp mik thêm bài này zới:

There are 30 days in the month of April.31 students will be celebrating their birthdays in that month

Can you find 2 student who were born on the same day? Why?

cảm ơn các bn rất nhiều, các bn làm đc bài nào thì chỉ mik zới nhé

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.

Giúp mik vs mn ơi 1. He used to ................. under the oil lamp because there was no electricity. 2. I used to. ..................... at 3 a.m. and go with my parents to get fresh water. 3. She used to ................ with dolls when he was a child. 4. They didn’t use to .................. any sports. 5. He didn’t use to ............ a scrapbook. 6. When they were younger, they used to ................ to the beach, ride a bike and collects comic. 7. I used................ very shy, but I am not anymore. 8. After school, my friend and I used to .............. chess andhide-and-seek. 9. I used to ................. my vacation in a summer camp with my friends. 10. I used to ............ a pet when I was 5 years old. Now I don’t have it anymore.play (dance, read, use, have, go, ride, collect, spend, jump, get up, be)