The equation to find the Volume of something is length*Width*height
therefore:
(I'm confused as to what 10/1/2 means so)
•on the assumption that 10/1/2 means 10 and a half - 10.5
then it would be - 15*10.5*2.5 = 393.75m^3
•on the assumption that 10/1/2 means 10 divided by 1/2 then it would be:
15*20*4 = 1200m^3