SSC CGL 16 Aug 2015 Shift 2 Paper

Question : 133 of 200

Marks: +1, -0

The percentage of metals in a mine of lead ore is 60%. Now the percentage of silver is

3/4

% of metals and the rest is lead. If the mass of ore extracted from this mine is 8000 kg, the mass (in kg.) of lead is :

Solution:

Required mass of lead
= 8000 ×

{60}/{100}

(1-3/{400})

= 8000 ×

{60}/{100}

{397}/{400}

= 4764 kg.

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