The cost of 8 pens and 14 fans is Rs. 500. What is the cost of 12 pens and 21 fans?
Explanation:
Let the cost of each pen and fan be p and f respectively.
⇒ 8p + 14f = 500 ⇒ 4p + 7f = 250 ...(1)
We need to find 12p + 21f
Multiplying (1) with 3 we get, ⇒ 12p + 21f = 750 .
Hence, option (c).
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