Question

A and b are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 respectively . If equal quantities of the alloys are melted to from a third alloy c , the ratio of gold and copper in c will be :

Answer 1

Answer:

Let 1 kg of each one of A and B be taken to form 2 kg of C.

Gold in 1 kg of A = 7/9, copper in 1 kg of A = 2/9

Gold in 1 kg of B = 7/18, copper in 1 kg of B = 11/18

Gold in 2 kg of C = (7/9 + 7/18) = 21/18 = 7/6

Copper in 2 kg of C = (2/9 + 11/18) = 15/18 = 5/6

Ratio of gold and copper in C = 7/6 : 5/6 = 7:5