



 
Hi Jim, You can use our volume calculator, but you need to use it twice. Use it first to find the volume of the ditch without the pipe, that is a ditch 20 in wide by 6 in deep by 128 ft long. Then find the volume of the pipe to see mow much stone you will need to remove to make room for it. I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 