Question

A wall 10m long 1 m height and 1 by 2 metre wide is to be made out of bricks the bricks are of size 20 cm into 10 cm into 10 cm how many bricks will be needed to make the wall?

Answer 1

Dimensions of the wall



Length = 10 m
Breadth = 1 m
Height = 2 m




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T.S.A of the wall = 2(lb + bh + lh)
= 2(10 × 1 + 1 × 2 + 10 × 2)
= 2(10 + 2 + 20)
= 2 × 32
= 74 m²




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Dimensions of the brick




Length = 20 cm
Breadth = 10 cm
Height = 10 cm



T.S.A of the wall = 2(lb + bh + lh)
= 2(20 × 10 + 10 × 10 + 20 × 10)
= 2(200 + 100 + 200)
= 2 × 500
= 1000 cm²



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Transferring the T.S.A of wall from 74 m² to cm² = 7400 m²





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=》 Bricks needed to build the wall = 7400/1000 = ${ \underline\textbf{7 bricks}}$