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Answer:

So each toffee = 5/3 Rs. Number of toffee that will be bought for 20 Rs = 20 / ( 5 / 3 ) = 20 * 3 / 5 = 12 . Therefore, By selling 12 toffees for 20 Rs. We will get 25% profit.

Solution :-

C.P of 15 toffees = Rs 20

C.P of 1 toffee = 20/ 15 => 4/3

So we get C.P of one toffee = 4/3

Now , we are given gain % = 25 %

We know that Formula of S.P = ( 100 + gain /100 ) * C.P

= 100 + 25 4

-------------------- * -----------

100 3

= 125 4

----------- * --------

100 3

= 500 /300 = 5/3

So S.P of one toffee = Rs 5/3

Therefore , Number of toffee sold = Total price/ S.P of one toffee

= 20 / ( 5/3)

= 20 * 3 / 5

= 60 / 5

= 12 Toffees Answer