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If the cost of 20 pens is Rs. 180, calculate the cost of 15 pens? Solution??

If the cost of 20 pens is Rs. 180, calculate the cost of 15 pens?

Solution??

Grade:12

1 Answers

Harshit Singh
askIITians Faculty 5963 Points
3 years ago
Dear Student
20 pens cost Rs. 180.

Now, let the cost of 15 pens be Rs. x

In such a condition, the cost of pens changes directly with the total number of pens i.e. they are directly proportional.



20/180 = 15/x

x = Rs. 135

Thanks

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