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1. |
In a 90 litre solution, acid and water are in the ratio 2 ∶ 1, To make the ratio of acid and water as 1 ∶ 2, how many litre of water should be added to the solution? |
A. | 80 |
B. | 75 |
C. | 90 |
D. | 120 |
Answer» D. 120 | |