Question

A field is 200 m long 150 m broad. There is a plot 50 m long 40 m broad, near the field. the plot is dug 7 m deep and the earth is taken out is spread evenly in the field by how much meter is the level of the field raised?. Give answer to the second place of decimals.

Answer 1

Let the height of the field rises by h meters

volume of filed (cuboidal) = Volume of earth dugout 

200×150×h=50×40×7
30000×h=14000
h=14000/30000
h=0.46m