Question

the ratio of zinc and copper is an alloy is 7:9. if the weight of copper in the alloy is 11.7 kg. find the weight of zinc in it​

Answer 1

Answer:

= 9.1 = x

Step-by-step explanation:

zinc : copper = 7 : 9 : : x : 11.7

= 7/9 x/11.7

cross multiplication

= 7*11.7=9*x

= 81.9 = 9x

= 81.9/9 = x

= 9.1 = x

Answer 2

The ratio of zinc and copper is an alloy is 7:9.

The weight of copper = 11.7 kg = 11700 g

Let the weight of zinc be x g.

According to condition,

7:9 :: x:11700

or, 7/9 = x/11700

or, 9x = 11700×7

or, 9x = 81900

or, x = 81900/9

or, x = 9100

The weight of zinc = x g = 9100 g = 9.1 kg.

Hence, the weight of zinc in the alloy is 9.1 kg.

Hope this helps you to get to your answer.