Math, asked by rubitiwary97, 4 months ago


19. An alloy of zinc and copper weighs 21 kg. If, in the alloy, the ratio of copper to zinc is 2: 5 find the weight of zinc in it



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Answers

Answered by sohamswarup2008
16

Step-by-step explanation:

In 21 kg alloy, mass of copper = 5/(5+2)*21 kg = 15 kg and that of zinc = 2/(5+2)*21 = 6 kg. Now, after adding 4 kg of copper, the new ratio of zinc and copper = 6:(15+4) = 6:19

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