Quantitative Aptitude Ques 1976

Question: A and B are two alloys of gold and copper in the ratio 7: 2 and 7: 11, respectively. If equal quantities of these two alloys are melted to form a new alloy C, then the ratio of gold and copper in C is

Options:

A) 6 : 5

B) 9 : 4

C) 12 : 7

D) 7 : 5

Show Answer

Answer:

Correct Answer: D

Solution:

  • 1 kg of each mixture is taken A = 7: 2 = 14 : 4 Gold $ =\frac{14}{18}; $ Copper $ =\frac{4}{18} $ $ B=7:11 $ Gold $ =\frac{7}{18}; $ Copper $ =\frac{11}{18} $

$ \therefore $ Required ratio $ =( \frac{14}{18}+\frac{7}{18} ):( \frac{4}{18}+\frac{11}{18} ) $ = 21: 15 = 7: 5

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