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

The ratio of coper and nickel by weight in the two alloys x and y ate

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