Asked by Aishu

An alloy contains zinc and copper in the ratio 7:9. Find the weight of copper if it has 31:5 kg of zinc
Answered by poorvi
Zinc in 2 kg of new alloy = (5/13 + 5/8) = 105/104 kg
copper in 2 kg of new alloy = (8/13 + 3/8) = 103/104 kg
Ratio of zinc and copper in new alloy = 105/104 : 103/104 = 105:103
hope this example helps.....
Answered by Reiny
I think you have a typo.
31:5 kg is not a unit of weight, did you mean 31.5 kg?

If so, then just use a ratio ....

zinc/31.5 = 7/9
9zinc = 220.5
<b>zinc = 220.5/9 = 24.5 kg</b>

notice :
24.5 : 31.5 = 245 : 315 = 7 : 9
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