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A 20m deep well with a …

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A 20m deep well with a diameter 7m is dug and the earth from digging is evenly spread out to form a platform 22m by 14m. Find the height of the platform.

Posted by Pragya Laddha 5 years ago

CBSE > Class 10 > Mathematics

2 answers

Manav Kumar 5 years ago

First , vol of earth dug out = volume of embankment. πr^2h= l×b×h. 770=22×14×h. h=2.5m.

2Thank You

Yogita Ingle 5 years ago

Diamter = 7 m

so, radius = 3.5 m

Earth dug out from (cylindrical) well

=π×r×r×h

= 22/7 ×3.5×3.5×20

=770m³

to from platform ...... (cuboidal)

volume of cuboid = l×b×h

770=22×14×h

so, height = 770/22 ×14 = 2.5m

1Thank You

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