Posted by **don ** on Sunday, July 29, 2012 at 12:39am.

121 balls are placed in group of 7and 5 in basket.how many baskets 0f 7 were there?

- math -
**MathMate**, Tuesday, July 31, 2012 at 9:08pm
An obvious solution would be

7*3+5*20=121

Consequently, change 5*7 for 7*5 gives

7*(3+5)+5*(20-7)=7*8+5*13=121

Similarly,

7*(8+5)+5*(13-7)=7*13+5*6=121

We cannot go further because number of baskets for groups of 5 will be negative.

So possible values for baskets of 7 are:

3,8,13

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