INFORMATION:
We know that:
- 1.9 cu yd of sand are needed for every 100 sq yd of surface
And we must find how much sand will be needed for 290 sq yd of surface
STEP BY STEP EXPLANATION:
To find it, we can write that 1.9 cu yd of sand are needed for every 100 sq yd of surface in the form of a fraction

Then, to find how much sand will be needed for 290 sq yd of surface, we must multiply it by the fraction

Finally, simplifying

So, 5.51 cu yd of sand will be needed for 290 sq yd of surface.
ANSWER:
5.51 cu yd of sand will be needed for 290 sq yd of surface.