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A and B are solutions of acid and water. The ratios of water and acid in A and B are 4 : 5 and 1 : 2 respectively. If x liters of A is mixed with y liters of B, then the ratio of water and acid in the mixture becomes 8 : 13 What is x : y?1. 5 : 62. 3 : 43. 2 : 34. 2 : 5 |
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Answer» Correct Answer - Option 2 : 3 : 4 Given: Ratio of water and acid in A = 4 ∶ 5 Ratio of water and acid in B = 1 ∶ 2 Calculations: Taking the ratio of water and acid in A and B in the equal unit, Ratio of water and acid in A = 4 ∶ 5 Ratio of water and acid in B = 3 ∶ 6 Ratio of water and acid in the mixture = (4x + 3y)/(5x + 6y) ⇒ (4x + 3y)/(5x + 6y) = 8/13 ⇒ 52x + 39y = 40x + 48y ⇒ 12x = 9y ⇒ x/y = 9/12 ⇒ x/y = 3/4 ∴ The ratio of x and y is 3 ∶ 4 |
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