A plumber is fitting a water pipe that is 3/4 foot long on to a water pipe that is 2/12 foot long. How long will the finished pipe be?

First, find a common denominator.

12 will work.

3/4 becomes 9/12, because 4x3=12, and 3x3=9

2/12 stays the same, because the denominator is already 12.

Now, add the two together.

9/12+2/12=11/12

The finished pipe will be 11/12 ft. long.