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