Question
3 pens + 5 pencils = ₹49
4 pens + 3 pencils = ₹47 Find cost of one pen.Solution
ATQ,
3p + 5q = 49, 4p + 3q = 47. Eliminate q ⇒ 11q = 55 ⇒ q = 5. Substitute: 4p + 15 = 47 ⇒ p = 8.
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