No$.5(20$ Points$)$

Using the average end method, calculate the volume of excavation $($in cubic yards$)$ of an $160ft$ long excavation area that has a width of $70ft$ at one end and $110ft$ at the other end. Both ends require $30ft$ of cut.

Point Breakdown

A sketch the above problem showing the dimensions: $(4$ points$)$

Detailed calculations: $(16$ points$)$