Need help with this word problem

Question

Lucy is mixing a cleaning solution to clean the floors. If she combines 1 gallon water with 1/8 gallon of ammonia and 2/9 gallon of vinegar, what is the total volume of the cleaning solution?

Answer 1

This is another problem adding fractions.

 

We have 1 + 1/8 + 2/9

 

Of course, 1 can be re-written as 8/8 (or 9/9). 

 

The common denominator is 72.

 

Let's re-write 1 as 72/72

 

We now have:

 

72/72 + 9/72 + 16/72 = 97/72 = 1 25/72 gal of cleaning solution