a rectanglular form is 3.5 meters long,2 2/5 meters wide and 2.5 meters deep.Tory filled it full of cement,leaving 25 centimeters space at the top.How many cubic meters of cement did Tory use?
(3.5)(2 2/5)(2.5-0.25) = 18.9 m^3
and it was probably concrete, not cement...