Question

In Rs 510 we bought 75 pens.Then find how many pens bought in Rs 102.

Answer 1

First divide 510/75=₹6.8 per pen

now divide 102/6.8=15 pens
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Answer 2

rs 510 is 75 pens
rs 1 is 75/510 pens
rs 102 is 75/510*102 is 75/ 5 is 15