How many bricks, each measuring 25 cm × 11.25 cm × 6 cm, will be needed to build a wall 8 m × 6 m × 22.5 cm ?
a) 5600
b) 6000
c) 6400
d) 7200
Answer: c
Explanation:
$$\eqalign{
& {\text{Number of bricks :}} \cr
& = \frac{{{\text{Volume of the wall}}}}{{{\text{Volume of 1 brick}}}} \cr
& = \left( {\frac{{800 \times 600 \times 22.5}}{{25 \times 11.25 \times 6}}} \right) \cr
& = 6400 \cr} $$
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