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1. |
Gold is 19 times as heavy as water and copper is 9 times as heavy as water. The ratio in which these two metals be mixed so that the mixture is 15 times as heavy as water, is |
A. | 3 : 1 |
B. | 3 : 2 |
C. | 2 : 3 |
D. | 4 : 3 |
Answer» C. 2 : 3 | |