Question

Raina got a prepaid debit card with $30 on it .For her first purchase with the card ,she bought some bulk ribbon at a craft store. The price of the ribbon was 6 cents per yard.If after that purchase there was $27.90 left on the card ,how many yards of ribbon did Raina buy?

Answer 1

Data:

• Total: $30

,

• Price of ribbon: 6 cents per yard

,

• Left after purchase: $27.90

Procedure:

`30-27.90=2.1`

Raina spent a total of $2.1 on ribbons.

To know how many yards she bought, we have to homogenize the units. For that, a conversion to dollars must be made.

`6\frac{cents}{\text{yard}}\cdot(0.01dollar)/(1cent)=0.06\frac{\text{dollars}}{\text{yard}}`

The yard is $0.06 per yard.

Finally, we can get the yards bought:

`2.1dollars\cdot\frac{1\text{yard}}{0.06\text{dollars}}=35`

Answer: 35 yards