Ratio and Proportion Practice Test 3

Question : 8 of 40

Marks: +1, -0

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 form a third alloy C. Then what is the ratio of gold and copper in C?

9 : 5
7 : 5
5 : 9
5 : 7

Validate

Solution:

The gold in mixture C

= 7/9+7/18=21/18=7/6

The copper in mixture C

=2/9+11/18=15/18=5/6

Hence, their required ratio

=7/6:5/6=7:5

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