Question

Two alloys are made by gold and copper in the ratio of 7 : 2 and 7 : 11 respectively. Same quantity of both alloys are mixed and third alloy is made. In this third alloy, ratio between gold and copper is equal to(1) 7:5 (2) 7 : 12(3) 14 : 13 (4) 2:11

Answer 1

Ratio of gold and copper in C will be=(7/9+7/18):(2/9+11/18)

=(21/18):(15/18)

=7:5

So, option 4)7:5 is the right answer