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1. |
Gold is 12 times as heavy as aluminum and copper is 5 times as heavy as aluminum.In what ratio gold and copper should be mixed to get an alloy 8 times of aluminum. |
A. | 2 : 1 |
B. | 3 : 4 |
C. | 1 : 2 |
D. | 4 : 3 |
Answer» C. 1 : 2 | |