Question

I am still stuck on this basic math question. Rosa has 3 3/4 pounds of dough. She uses 1/8 of a pound for one roll. How many rolls could be made from Rosa's dough? I was told 30. But how did they get this answer?

Answer 1

Step-by-step explanation:

First convert the amount of dough into an improper fraction:

$3\frac{3}{4}\:\text{lbs} = \dfrac{15}{4}\:\text{lbs}$

Each roll is 1/8 lb so divide the amount of dough by this amount:

$\dfrac{\left(\dfrac{15}{4}\:\text{lbs}\right)}{\left(\frac{1}{8}\:\text{lb/roll}\right)} = \left(\dfrac{15}{4}\:\text{lbs}\right)\cdot \left(8\:\dfrac{\text{roll}}{\text{lb}}\right) = 30\:\text{rolls}$