Question

a field is 150 m long and 70 m board. A circular tankof radius 7m and depth 20 m is dug in the field and earth taken out from the tank spread evenly over the field . find the height of field raised by it

Answer 1

Available area for spreading = 150*70 - $\pi *7^{2}$

= 10346 $m^{2}$

Volume of earth dug out = $\pi 7^{2} *20$ = 3080 $m^{3}$

Volume = 10346 * rise in height

3080 = 10346 * h

h = 0.297 m