Question

7. An alloy is made up of iron and copper. Copper and iron are present in the ratio 7: 5
in the alloy. If it contains 65 gram of copper, what is the weight of the alloy?

Answer 1

Answer:

Lets assume iron is x gram

copper:iron=7:5

65:x=7:5

x= (65×5) ÷7

≈46.43

so the weight of the alloy is 65+46.3 gram = 111.3 gram