Question

if the cost of 20 pens is rupees 220,calculate the cost of 15 pens direct and inverse proportion
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Answer 1

Answer:

The cost of 15 pens is ₹165. Didn't understood how? Let's see the Explanation.

Explanation:

Cost of 20 pens = ₹220

Cost of 1 pen = 220 ÷ 20

= ₹11

Cost of 15 pens = ₹11 * 15

= ₹165

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