Question

A wall 10m long 1m high and 1
_
2 wide

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 =