Question

A and B are two different alloys of gold and silver having the two metals in the ratio 7-2 and 7
1 respectively. If equal quantities of both the alloys are mixed to prepare a third alloy Cten the
proportion of gold and silver in C is
A 112. 15
B. 117:25
C. 115: 12
D. 119-25​

Answer 1

Step-by-step explanation:

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Answer 2

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

Option 4):is the answer