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