Easy Way
100÷40=2.5 is exact middle of the integers so 20 integers are above 2.5 and 20 integers are below
22..21..20..19..18..17..16..15..14..13..12..11..10..9..8..7...6..5..4..3
2.5
2..1..0..-1..-2..-3..-4..-5..-6..-7..-8..-9..-10..-11..-12..-13..-14..-15..-16..-17..
This link will show you different equations
http://web2.0calc.com/questions/the-sum-of-40-consecutive-integers-is-100-what-is-the-smallest-of-these-40-integers
The Volume is 4.5ft.
Hope this helps!!
