Question

A and b are two alloys of gold and copper prepared by mixing metals in proportions 7 : 2 and 7 : 11 respectively. if equal quantities of alloys are melted to form a third alloy c, the proportion of gold and copper in c will be : 1) 5 : 9 2) 5 :7 3) 7 : 5 4) 9 : 5 5) none of these

Answer 1

5) None of these . Because when you add the allows a and b you get the proportional value of 14:13