A goes through 2 3/5 boxes of nails in 3 1/2 rooves. How much would he use to finish 8 rooves?

Question

mathstudent55 · Answer

By "rooves", do you mean "roofs", the plural of "roof"?

mathstudent55 · Answer

Use a proportion.

Let x = the unknown number of boxes needed for 8 roofs.

$\large 2\dfrac{3}{5}$ boxes are to $\large 3 \dfrac{1}{2}$ roofs as x boxes are to 8 roofs.

$\Large \dfrac{2\frac{3}{5}}{3 \frac{1}{2}} = \dfrac{x}{8}$

Convert the mixed numerals into fractions.
Then cross multiply and solve for x.

knightofpentacles · Answer

|dw:1445777990208:dw|