Answer:
D. 184
Step-by-step explanation:
There are 12 months in one year.
If he spends 15 1/3 hours per month playing tennis, then he spends 12 * 15 1/3 hours per year.
We need to multiply 12 by 15 1/3.
12 * 15 1/3 =
= 12(15 + 1/3)
= 12 * 15 + 12 * 1/3
= 180 + 4
= 184
He spends 184 hours per year playing tennis.