Question
15 pens and 30 pencils cost Rs. 180. If the cost of a
pencil is Rs. 4, then find the cost of 10 pens.Solution
ATQ, Let the cost of a pen be Rs. n. So, 30 × 4 + 15n = 180 Or, 120 + 15n = 180 Or, 15n = 60 Or, n = 4 Therefore, cost of 10 pens = 10 × 4 = Rs. 40
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