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Let daughters age = x years And let son’s age = y years ∴ Father’s age = 4x years Mother’s age = 3 y years ∴ 4x – 3y = 12 -------- (1) y – x = 6 -------------- (2) By solving both the equations 1 and 2, we get y = 36 By putting value of in equation (2) we will get sister’s age ∴ Sister’s age = 36 - x = 6 ∴ x = 30 years
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