Question

An alloy contain only zinc and copper and they are in the ratio of 7:9 if the weight of the alloy is 8kg then find the weight of the copper

Answer 1

Answer:

Step-by-step explanation:

Ratio = 7:9

Weight of zinc =7x and weight of copper = 9x

7x + 9x = 8kg

16x = 8kg

x = 8/16 kg

Weight of copper = 9x

9x = 9*8/16

= 4.5kg

.........ANS

Answer 2

The weight of the copper is 4.5 kg

Step-by-step explanation:

Given, the weight of the alloy = 8 kg

The ratio of zinc and copper = 7 : 9

The proportion of zinc in the alloy is

= 7/(7 + 9) = 7/16

and that of copper is

= 9/(7 + 9) = 9/16

∴ the weight of copper in the alloy is

= 8 × 9/16 = 4.5 kg

Remark:

In this type of problems, always try to find the proportions of the materials or ingredients as given in questions and then proceed in necessary way.