Question

An alloy contains zinc and copper in the ratio 7:9. Find the weight of copper if it has 31.5 kg of zinc.​

Answer 1

Answer:

Ratio of zinc and copper = 7:9

Let the ratio be 7x : 9x

Weight of copper = 12.6kg =12600g

=> 9x = 12600g

=> x = 1400g= 1.4kg

=> 7x(Weight of zinc) = 7 * 1.4 kg = 9.8 kg

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

An alloy contains zinc and copper in the ratio 7:9

Let the weight of zinc be 7x then weight of copper = 9x

Given  7x=31.5

x = 31.5/7 = 4.5kg

Weight of copper = 9*4.5 = 40.5kg