Question

a rectangular pit 1.4 m long, 90 cm broad and 70 cm deep was dug and 1000 bricks of base 2 cm by 10.5 cm were made from the earth dug out.find the height of each book

Answer 1

The height of the block is 42( if that is what u want

Answer 2

Here l = 1.4 m = 140 cm, b = 90 cm and h = 70 cm

Volume of rectangular pit = l × b × h

= (140 × 90 × 70) cm3

= 882000 cm3

Volume of brick = 21 × 10.5 × h

Now,

Number of bricks = Volume of pit/ Volume of brick

1000 = 882000/ (21 × 10.5 × h)

h = 882000/ (21 × 10.5 × 1000)

= 4 cm

Thus, the height of each brick is 4 cm.

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