Indian Institute of Foreign Trade 2015 Solved Paper

Question : 18 of 124

Marks: +1, -0

There are two alloys P and Q made up of silver, copper and aluminium. Alloy P contains 45% silver and rest aluminium. Alloy Q contains 30% silver, 35% copper and rest aluminium. Alloys P and Q are mixed in the ratio of 1:4.5. The approximate percentages of silver and copper in the newly formed alloy is:

33% and 29%
29% and 26%
35% and 30%
None of the above

Validate

Solution:

(a) P

\;\;\;\;\;\;\;\;\;\;\;\;\;

Q
10 kg

\;\;\;\;\;\;\;\;\;\;\;\;\;

45 kg
Silver 4.5 kg

\;\;\;

0.3×45 = 13.5 kg
Aluminium 5.5
Copper –

\;\;\;\;\;\;\;\;

0.35 × 45 = 15.75 kg
∴ In the alloy of 55 kg
Silver = 4.5 + 13.5 kg = 18 kg
Copper = 15.75 kg.
% of Silver =

18/55×100=

33%
% of Copper =

15.75/55×100≈29%

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