The number of bricks, each measuring 25 cm x 12.5 cm x 7.5 cm required to construct a wall 6 m
long, 5 m high and 0.5 m thick, while the mortar occupies 5% of the volume of the wall, is
(d) 8120
(a) 3040
(b) 5740
(c) 6080
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Answer:
volume of wall = 6×5×0.5 = 15m^3 =
volume of bricks = 0.25×0.125×0.075 m^3
= 0.00234375 m^3
volume occupied by mortar = 5/100 × 15 = 3/4 m^3
volume left = 15 - 3/4 = 57/4 m^3 =14.25 m^3
no. of bricks = volume left / volume of bricks
= 14.25/ 0.00234375
= 6080 bricks
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