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Fractions and Ratios

The ratio of ...

Question

The ratio of zinc and copper in an alloy is 7:9. If the weight of the copper in the alloy is 11.7 kg, find the weight of the zinc in the alloy.

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Solution

Given that ratio of zinc and copper in an alloy is 7:9
Let their ratio = 7x: 9x
Weight of copper = 11.7kg
9x = 11.7
x = 11.7/9
x = 1.3
$W e i g h t o f t h e z i n c i n t h e a l l o y = 1.3 \times 7 = 9.10 k g$

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Q. The ratio of zinc and copper in an alloy is 7 : 9. If the weight of the copper in the alloy is 11.7 kg, find the weight of the zinc in the alloy.

Q. The ratio of zinc and copper in an alloy is 7 : 9. If the weight of copper in the alloy is 11.7 kg find the weight of zinc in it.

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