Mixture and Alligation

Quantitative Aptitude(IBPS RRB PO)

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Alloy A contains 40% gold and 60% silver. Alloy B contains 35% gold and 40% silver and 25% copper. Alloys A and B are mixed in the ratio of 1:4 .What is the ratio of gold and silver in the newly formed alloy is?

20% and 30%

36% and 44%

25% and 35%

49% and 36%

Explanation:

Assume the weight of alloy a is 100 kg

Therefore, The weight of alloy B is 400kg

Gold silver copper

A 40kg 60kg 0kg

B 140kg 160kg 100kg

total 180kg 220kg 100kg

Therefore, Ratio of gold and silver in new alloy = 180/500 : 200/500

= 36% : 44%

Hence, option 2 is the correct answer.

By: Amit Kumar

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