Rodrigo practiced playing the guitar 15 1/3 hours over the past 3 weeks. He practiced for 5 1 / 4 hours during the first week and 4 2/3 hours during the second week. The equation that represents the problem is

Add up the sum and divide.

Practice Chart

1st Week: 6.25 Hours

2nd Week: 4.66 Hours

3rd Week: 15.33 - (1st Week + 2nd Week)

Solve:

6 1/4 + 4 2/3 = 10 8/12 or 10 2/3

15 1/3 - 10 2/3

14 4/3 - 10 2/3

4 2/3 hours practiced third week