Question

30. Daniel puts some wheat flour into an empty bowl. Then he adds `2/3` cup rye flour to make a total of `2 5/12` cups of flour. How much wheat flour is in the bowl?

Answer 1

`1 3/4` cups of wheat flour

Explanation:

To find out how much wheat flour was in the bowl before Daniel added rye flour, you have to subtract the total amount of flour by the rye flour he added.
`2 5/12 - 2/3`

First, find the common denominator so you can subtract the fractions. To do that, multiply both sides of 2/3 by 4 to get the denominator 12.
`2/3 * 4/4 = 8/12`

You cannot subtract 8/12 from 2 5/12 . Borrow a whole from 2 by adding 12/12 to 5/12 .
`2 5/12 -> 1 17/12`

Subtract.
`1 17/12 - 8/12 = 1 9/12`

Simplify.
`1 9/12 -> 1 3/4`