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If cost of 12 pens is ₹ 84, then what is the cost of 10 such pens?

₹ 90
₹ 72
₹ 65
₹ 70

Correct Answer: ₹ 70

Explanation:

∵ Cost of 12 pens = ₹ 84
Cost of 1 pen = ₹ 84/12
∴ Cost of 10 pens = (84/12) x 10
= 7 x 10 = ₹ 70

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