Question

the ratio of zinc and copper in an alloy is 9:7 if the weight of copper vin the alloyis 9.8 kg ,find the weight of zinc in the alloy ?
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Answer 1

Answer:

Correct option is A)

Given,

Weight of zinc in the alloy =9.8kg

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

Let,

Weight of copper =9x

Weight of zinc =7x

                 9.8=7x

                    x=1.4kg

∴ Weight of copper in the alloy =9x

                                                     =9(1.4)

                                                     =12.6kg

Step-by-step explanation:

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Answer 2

Answer:

12.6 kg

Step-by-step explanation:

zinc : copper

   9 : 7

?kg : 9.8 kg

to get to 9.8kg from 7, 7 is multiplied by 1.4 to get 9.8 kg

7 x 1.4 = 9.8

therefore to get ?, 9 must also be multiplied by 1.4

9 x 1.4 = 12.6kg