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

Explanation:

First convert the amount of dough into an improper fraction:

`3(3)/(4)\:\text{lbs} = (15)/(4)\:\text{lbs}`

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

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