There are in all, 10 balls; some of them are red and the others white. The average cost of all balls is 28. If the average cost of red balls is 25 and that of white balls is 30, the number of white balls is :

There are in all, 10 balls; some of them are red and the others white.

1.	There are in all, 10 balls; some of them are red and the others white. The average cost of all balls is 28. If the average cost of red balls is 25 and that of white balls is 30, the number of white balls is :
A.	3
B.	5
C.	6
D.	7
Answer» D. 7

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There are in all, 10 balls; some of them are red and the others white. The average cost of all balls is 28. If the average cost of red balls is 25 and that of white balls is 30, the number of white balls is :

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