the dimensions of a field are 20 m by 5 m . a pit 10 m long , 4 m wide and 3 m deep is dug in one corner of the field and the earth removed has been evenly spread over the remaining area of the field . what will be the rise in the height of field as a result of this operation ?
"the volume of the earth removed is 10 * 4 * 3 = 120 m ^ 3 . the remaining area of the field is 20 * 5 - 10 * 4 = 60 m ^ 2 . 120 m ^ 3 of the earth evenly spread over the area of 60 m ^ 2 will rise the height by ( height ) = ( volume ) / ( area ) = 120 / 60 = 2 m . answer : d"
divide(multiply(5, 10), subtract(rectangle_area(20, 5), rectangle_area(4, 10)))