Question

A field is 150 m long and 80m board a tank 40 m long 20 m board and 10 m deep is dig in the field and the earth taken out of it is spread evenly over the field how much is the field raised

Answer 1

First let's find the area of the field:
Area=150*80
Area=12000m^2

Area of the pit=40*20
Area=800m^2

Remaining area =12000-800
Area =11200m^2

Volume of earth taken out=40*10*20
Volume=8000m^3

Volume of the earth taken out=Volume of the field
8000=base area *height
8000=11200*height
height=8000/11200

Height=0.71 metres