Mathematics

If 8 pens cost ₹ 356, what is the cost of 14 pens?

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Given:

Cost of 8 pens = ₹ 356

Cost of 14 pens = ?

Let the cost of 14 pens = ₹ x

Ratio of pens : Ratio of costs

8 : 14 :: 356 : x

By the rule: Product of Extremes = Product of Means:

8 × x = 14 × 356

⇒ x = $\dfrac{14 \times 356}{8}$

⇒ x = 14 x 44.5

⇒ x = 623

Hence, the cost of 14 pens is ₹ 623.

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