Question

Martin has a compost pit in his garden. The pit is 9 feet long, 6 feet wide, and 2 feet deep. She plans to make it 1.5 feet deeper.

What will be the increase in the volume of the pit?
Answer
18 cubic feet
54 cubic feet
81 cubic feet
162 cubic feet

Answer 1

81 cubic feet

Answer 2

i got like 109.5 i know im rong

Answer 3

the length and width of the pit remain the same, so we can consider it as a cuboid of
l*b*h = 9*6*1.5 = 81

Answer 4

thank you
XD

Answer 5

\[Volume= length\ \times breadth\ \times depth\]
Earlier Volume
\[Volume=9 \times 6 \times 2=108\ feet^3 \]
Now depth is increased by 1.5 feet
so
\[New\ Volume=9 \times 6 \times 3.5=189 feet^3\]
Increase ij Volume=189-108= 81 feet^3