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ATQ,
Let the income of 'P' and 'Q' be Rs. '5x' and Rs. '4x' respectively, and expenditure of 'P' and 'Q' be '9y' and Rs. '7y' respectively. 5x - 9y = 10000 -------- (I) And, 4x - 7y = 10000 ---------- (II) From equation I and II, We get, 5x - 9y = 4x - 7y Or, x = 2y On putting value of 'x' in equation I, We get, 5 × 2y - 9y = 10000 Or, 10y - 9y = 10000 Or, y = 10000 Required difference = 9y - 7y = 2y = 2 × 10000 = Rs. 20,000
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