Question

For a certain kind of plaster work, 1.5 cu yd of sand are needed for every 100 sq yd of surface. How much sand will be needed for 350 sq yd of surface?

Answer 1

We are told that we need 1.5 cu yd of sand for every 100 sq yd of surface, then we can express the ratio of sand to surface like this:

`\text{ratio}=(1.5)/(100)`

In order to find how much sand we need for 350 sq yd of surface, we just have to multiply 350 by this ratio, then we get:

`350*(1.5)/(100)=5.25`

Then, we need 5.25 cubic yards of sand.