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Andrew, Bryan and Charlie each draws two card from a stack of cards number 1 to 8. • One of Bryan's cards has a number twice of the other. • The sum of the numbers on Charlie's cards is 9. • The sum of the numbers on Andrew's cards is 7 but the difference is not 3. Which two cards are not drawn?
For a grid of 10 lines and 10 columns. Two children and children coloring boxes, each one a color in three colors: blue, red, purple. Credit: "Every time we finish the cells there are two lines on the two lines that have a color number of this cell line by the number of cells in the other." Nhi said: "I discovered there are always two columns are painted like that."
Come on, tell who is right, who's wrong?
In the 3×3 table shown, the numbers 2, 4 and 6 are placed so that each number occurs only once in each row and only once in each column. The value of M + N is ............
In the 3×3 table shown, the numbers 2, 4 and 6 are placed so that each number occurs only once in each row and only once in each column. The value of M+N is
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 s...
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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.
the k-row of the theatre has 300 seats.annabella walks into the row and realizes that some one is sitting next to her no matter which seat she chooses.how many people arealready seated in k-row
Lesson 1: Join the Phu Dong Health Club There are 222 players in two sports: football and volleyball. Each football team has 11 people. Each volleyball team has 6 people. Know that there are all 27 teams, count the number of soccer teams, volleyball team.
Help me and make friends with me
There are 4n pebbles of weights 1, 2, 3, . . . , 4n. Each pebble is coloured in one of n colours and there are four pebbles of each colour. Show that we can arrange the pebbles into two piles so that the following two conditions are both satisfied:
• The total weights of both piles are the same.
• Each pile contains two pebbles of each colour.
Of the 64 proctors volunteering today, all are on the Mt. Spokane Math Team. 36 are taking AP Calculus, 18 are taking AP Biology, 16 are taking AP English, 4 aretaking AP Biology and AP Calculus, 7 are taking AP Biology and AP English and 5 aretaking AP Calculus and AP English. Seven are not taking any AP courses. How manyare taking all three courses AP Biology, AP Calculus and AP English at the sametime?