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Quantity B: Five years ago, the average age of husband and wife was 27 years and today, the average of husband, wife and their child is 22 years. What is the age of the child?1). Quantity A > Quantity B2). Quantity A < Quantity B3). Quantity A ≥ Quantity B4). Quantity A ≤ Quantity B |
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Answer» Quantity A: Difference in temperatures of Monday and Friday = (39 × 4) – (37 × 4) = 8 The temperature of Friday is 4/5 TIMES that of Monday; If X is the temperature of Monday; ∴ X – 4X/5 = 8 ⇒ X/5 = 8 ⇒ X = 40 ∴ 5% of X = 40 × 0.05 = 2 Quantity B: Five YEARS ago, the AVERAGE age of husband and wife was 27 years; ∴ Total age of husband and wife today = 27 × 2 + 10 = 64 years Since the average of husband, wife and their child is 22 years today; ∴ Total age of husband, wife and child today = 22 × 3 = 66 years ∴ Age of the child = 66 – 64 = 2 years ∴ Quantity A = Quantity B |
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