Pahelp po, wag kayo mukang points.

Answer:
21. 12/15
22. 11/42
Step-by-step explanation:
21. 2/15+7/15=9/15+3/15= 12/15
22. 5/6-4/7
5x7=35
6x4=24
6x7=42
35-24=11
11/42