Question

The ratio of zinc and copper in an alloy is 7:9 If the weight of copper in the alloy is 12.6 kg Find the weight of zinc in it ?

Answer 1

Ratio of zinc and copper = 7:9
Let the ratio be 7x : 9x
Weight of copper = 12.6kg =12600g
=> 9x = 12600g
=> x = 1400g= 1.4kg
=> 7x(Weight of zinc) = 7 * 1.4 kg = 9.8 kg

Answer 2

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

the weight of copper in the alloy is 12.6 kg

To Find :   the weight of zinc

Solution:

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

=> zinc  : copper = 7 : 9

zinc = 7k   kg

copper = 9k  kg

weight of copper in the alloy is 12.6 kg

=> 9k  = 12.6

=> k = 1.4

weight of zinc  = 7k

= 7(1.4)

= 9.8 kg  

weight of zinc in alloy = 9.8 kg

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