Question

Bill's recipe for onion soup call for 4.0lb of thinly sliced onions. If an onion has an average mass of 115g, how many onions does Bill need. 2. 102: The price of 11b of potatoes is $1.75. If all the potatoes sold today at the store bring in $1420, how many kilograms of potatoes did the grocery shoppers buy?

Answer 1

1.
`16\ onions`

2.
`4,040.91\ kg`

Explanation:

1. You know that the average mass of an onion is 115 grams and Bill needs 4.0 pounds.

Then, since
`1\ lb=453.592\ g`, we can make the following conversion:

`(4.0\ lb)((453.592\ g)/(1\ lb))=1,814.37\ g`

Then, the number of onions Bill needs is:

`(1,814.37\ g)((1\ onion)/(115\ g))=15.77\ onions` ≈
`16\ onions`

2. Since
`1\ kg=2.20462\ lb`, we can make the following conversion:

`(11\ lb)((1\ kg)/(2.20462\ lb))=4.98\ kg`

Knowing that all the potatoes sold today at the store bring in $1,420 and 4.98 kilograms of potatoes is $1.75, we can calculate the amount of kilograms the grocery shoppers bought:

`(\$1,420)((4.98\ kg)/(\$1.75))=4,040.91\ kg`