Question

the ratio of zinc and copper in an alloy is 2:7 .if the weight of the copper in an alloy is 10.5 gm then find the weight of zinc​

Answer 1

Answer:

It is given that copper and zinc are in 5:3. and weight of copper = 30.5 gm

So, total weight of alloy = 3+5 =8

weight of copper 5/8 = 30.5

so weight of an alloy = 30.5 x8/5 = 6.1 x8 = 48.8 gm

So weight of zinc = 3 x48.8/8 = 3 x6.1 = 18.3 gm

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Answer 2

Answer: 3gm

Step-by-step explanation: Ratio=2:7

Copper weight= 10.5gm

2:7= x:10.5

2×10.5= 7×x

21=7x

x = 21/7

x=3

Zinc = 3gm

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