Mahi works for 40 hours in 5 days.
She worked 5(3/4) hours on Monday.
She worked 6(1/2) hours on Tuesday.
She worked 5(1/8) hours on Wednesday.
How many hours she worked altogether on Thursday and Friday?

Answer: A. 22(5/8)

The correct answer is A. 22(5/8).
First, add the hours from Monday to Wednesday by using a common denominator (8):
Monday: 5¾ = 46/8
Tuesday: 6½ = 52/8
Wednesday: 5⅛ = 41/8
Total so far: 139/8 = 17⅜ hours
Subtract this from the 40-hour total:
40 - 17⅜ = 22⅝ hours.

Answering after opening this box earns no Practice Points.