Question

Robin used one fourth of a pound of butter to make a cake. Before she started she seven eighths of a pound of butter. How much butter did robin have when she was done baking? Give your answer as a fraction of a pound

Answer 1

`(5)/(8)` pounds.

Explanation:

To find how much butter Robin had after baking, we first need to find how much she initially had.

According to the problem Robin had 7/8 of a pound of butter.

She used 1/4 of a pound of butter to make a cake.

This gives us:

`(7)/(8)-(1)/(4))`

Since we have different denominators, we need to first find the LCD of the fractions.

`(7)/(8)-(1)/(4)((2)/(2)`

`(7)/(8)-(2)/(8)`

Now that they have the same denominators, we can then subtract them directly.

`(5)/(8)` pounds.