Question

how many bricks each 25cm long 16cm wide and 7.5cm thick will be needed to build a wall 5m long, 3m broad and 80cm high?​

Answer 1

Step-by-step explanation:

2 (lb +bh+hl)

2 (25×16+ 16×7.5+7.5×25)

2 (400+120+187.5)

2×707.5

1107.5

2 (lb+bh+hl)

2 (5×3+3×80+80×5)

2 (15+240+400)

2×655

1055

Answer 2

area of wall =l×b×h
=500×300×80
=12,000,000 cm^3

area of brick=l×b×h
=25×16×7.5cm^3
=3000cm^3
there fore no.brick=12000000÷3000
=40000 brick's