Arithmetichard · Past Paper
Gold is 19 times as heavy as water and copper is 9 times as heavy as water. In what ratio should these be mixed to get an alloy 15 times as heavy as water?
A1:1
B2:3
C3:2
D3:4
✓ Correct Answer: C — 3:2
Using alligation: (15-9):(19-15) = 6:4 = 3:2.
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