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A 20-kg alloy contains zinc and copper in the ratio 3:5. If 4 kg of an alloy is replaced with 4 kg of copper, what will be the ratio of zinc and copper?
A)1/7 B)3/7 C)1/6 D)1/8
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- Z : C = 3 : 5, total alloy = 20 kg
remove 4 kg of alloy , 20 - 4 = 16 kg
copper value in 16 kg is = 16 * 5/8 = 10 kg, hence zinc value is 6 kg
if we add 4 kg of copper then value of copper = 10 + 4 = 14 kg
The new ratio of zinc and copper are = 6/14 = 3/7 - 3 years agoHelpfull: Yes(0) No(0)
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