SSC CGL 30 Aug 2015 Paper

Question : 133 of 200

Marks: +1, -0

The paint in a certain container is sufficient to paint an area equal to 9.375 m2. How many bricks measuring 22.5 cm by 10 cm by 7.5 cm can be painted out of this container?

200
1000
10
100

Validate

Solution:

Whole surface area of a brick
= 2 (l × b + b × h + h × l)
= 2 (22.5 × 10 + 10 × 7.5 + 7.5 × 22.5)
= 2 (225 + 75 + 0.75 × 225)
= 2 × 75 (3 + 1 + 0.75 × 3)
= 150 × 6.25
= 937.5 sq. cm.
∴ Number of bricks
=

{9.375×100×100}/{937.5}

= 100

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