Contemporary math

Question

You want to put a 5 inch thick layer of topsoil for a new 27 ft by 14 ft garden. The dirt store sells by the cubic yards. How many cubic yards will you need to order? The store only sells in increments of 1/4 cubic yards.

____cubic yards

Answer 1

27x14x5/12 ft^3

=157.5 ft^3

=157.5/27= 5.8333...cubic yards

times 4 = 23 1/3

buy 25

as 24 isn't enough, 1/3>1/4