Two alloys contain gold and copper in the ratios 7 : 2 and 7 : 11. Equal weights of the two alloys are melted together. What is the ratio of gold to copper in the new alloy?

A. 7 : 5

B. 5 : 7

C. 7 : 6

D. 14 : 13

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cgl Save WhatsApp Report

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Answer: A. 7 : 5

Answer: (A) 7 : 5

Take 18 kg of each (LCM of 9 and 18).

First alloy: gold 14 kg, copper 4 kg. Second alloy: gold 7 kg, copper 11 kg.

Total gold : copper = 21 : 15 = 7 : 5.

Trap: adding the ratios directly (14 : 13) is wrong because the two ratios have different totals.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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