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?

1 Answer
Mar 6, 2018

#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#