作业帮There are 8 boxes on the table.There are red balls or blue b
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There are 8 boxes on the table.There are red balls or blue balls ,and each box contains different number of balls.They are 7,10,13,18,28,31,46,62.Suppose you don't know the colors and the numbers of the balls .Now you take away 1 box,and the red balls are 2 times as the blue balls in the boxes left.Please find out which box did you take away.
The answer is 62.
After you took out one ball the total number has to be dividable by 3 because red balls are 2 times as the blue balls.
consider what left by dividing 3 for all these numbers:7 (1); 10 (1); 13 (1); 18 (0); 28 (1); 31 (1); 46 (1); 62 (2).You have to take 62 off so that the sum is dividable by 3.
If you really want to know what is red and what is blue,the answer is not clear because there are two possibilities:
A:red:10,18,28,46; blue:7,13,31
B:red:7,18,31,46; blue:10,13,28
Yours,
Ping
After you took out one ball the total number has to be dividable by 3 because red balls are 2 times as the blue balls.
consider what left by dividing 3 for all these numbers:7 (1); 10 (1); 13 (1); 18 (0); 28 (1); 31 (1); 46 (1); 62 (2).You have to take 62 off so that the sum is dividable by 3.
If you really want to know what is red and what is blue,the answer is not clear because there are two possibilities:
A:red:10,18,28,46; blue:7,13,31
B:red:7,18,31,46; blue:10,13,28
Yours,
Ping
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