1.

A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 ∶ 2 and 7 ∶ 11 resp. If equal quantities of the alloys are melted to form a third alloy C, Find the ratio of gold and copper.1). 6 ∶ 72). 7 ∶ 53). 3 ∶ 84). 7 ∶ 6

Answer»

In 1 KG of alloy A, Gold = 7/9 and Copper = 2/9

In 1 kg of alloy Q, Gold = 7/18 and Copper = 11/18

Ratio of Gold and Copper in alloy C

= 7/9 + 7/18 ? 2/9 + 11/18

= 21 ? 15 = 7 ? 5


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