**An alloy of zinc and copper weighs 12 kg. if in the alloy, the ratio of zinc and copper is 1 : 4, find the weight of copper in it.**

###### Answers:

Weight of alloy = 12.1/2 kg = 25/2 kg.

Given ratio =1 : 4

Sum of ratio =1 + 4 = 5

Weight of copper = 4/5 × 25/2 kg = 2 x 5 = 10 kg