We can find the length using the values given for width. Simply divide 10 by 4 to get the conversion unit and multiply that unit by 7 in. So, 10/4=2.5, and 2.5*7=17.5 in. Thus, the length is 17.5 inches.
We find the area using the formula A=lw where l=length and w=width. So, A=17.5(10). The area is 175 square feet.
Two cans, since 175/125=1.4. We cannot buy 2/5 of a paint can, so we must buy two.
