The ratio of copper and nickel by weight in the two alloys x and y are 2 : 7 and 5 : 4. How many kilogram of the alloy x and y are required to make 42 kg of new alloy z in which the ratio of copper and nickel is same?

The ratio of copper and nickel by weight in the two alloys x and y are

1.	The ratio of copper and nickel by weight in the two alloys x and y are 2 : 7 and 5 : 4. How many kilogram of the alloy x and y are required to make 42 kg of new alloy z in which the ratio of copper and nickel is same?
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