A trench 3m wide and 2m deep is dug all around inside a rectangular plot 46m by 36m and the earth dug out is spread evenly on the remaining portion. By how much will the level of earth raised.
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Sol:
Diameter of the well = 7 m
Radius of the well = 7/2 m
Depth of the well = 20 m
Volume of the mud dug from the well = πr2h
= 22/7 × 7/2 × 7/2 × 20
= 770 m3
Area of the rectangular plot where the mud is spread = 22 x 14
Let the height of the plotfarm be h metres.
Volume of the plot form = Volume of the mud taken from the well
22 x 14 x h = 770
h = 770 / 22x14
h = 2.5 m
Hence, the height of the platform formed is 2.5 m
Diameter of the well = 7 m
Radius of the well = 7/2 m
Depth of the well = 20 m
Volume of the mud dug from the well = πr2h
= 22/7 × 7/2 × 7/2 × 20
= 770 m3
Area of the rectangular plot where the mud is spread = 22 x 14
Let the height of the plotfarm be h metres.
Volume of the plot form = Volume of the mud taken from the well
22 x 14 x h = 770
h = 770 / 22x14
h = 2.5 m
Hence, the height of the platform formed is 2.5 m
saxenayashi890:
Can't understand the value you took
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