Quantitative Aptitude Ques 1414

Question: Zinc and copper are in the ratio 5: 3 in 400 g of an alloy. How much of copper (in grams) should be added to make the ratio 5: 4?

Options:

A) 72

B) 200

C) 50

D) 66

Show Answer

Answer:

Correct Answer: C

Solution:

  • Quantity of zinc in the alloy $ =\frac{5}{5+3}\times 400 $ $ =\frac{5}{8}\times 400=250g $ and quantity of copper $ =\frac{3}{5+3}\times 400 $ $ =\frac{3}{8}\times 400=150g $ Let required quantity of copper be $ xg. $ $ \frac{250}{150+x}=\frac{5}{4} $

$ \Rightarrow $ $ 1000=750+5x $
$ \Rightarrow $ $ 5x=250 $

$ \Rightarrow $ $ x=50 $

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