a brick measures 20 cm by 10 cm by 15/2 cm. how many bricks will be required for a wall 25m long , 2m high , 3/4 m thick? a) 25,000 b) 20,000 c) 30,000 d) 45,000 answer :
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Step-by-step explanation:
given :-
• dimensions of the brick is = 20cm × 10cm × 7.5cm (15/2)
• dimensions of the wall is = 25m × 2m × 0.75m (3/4m)
in cms :-
25m = 25 × 100 = 2500cm, 2m = 2 × 100 = 200cm and 0.75m = 0.75 × 100 = 75cm.
volume of the brick = l × b × h
= 20 × 10 × 7.5
= 1500cm³
volume of the wall = l × b × h
= 2500 × 200 × 75
= 37500000cm³
therefore no. if bricks required for the wall = (volume of wall)/(volume of the brick)
= 37500000/1500
= 25000 bricks
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