Answer:

Step-by-step explanation:




Basically, you need to add a number to both sides so that you can reduce the left side to a square. In this case, you add 4.
4.8
Step-by-step explanation:
3 over 5+21 over 5=4.8
I think it’s 2 hours and 35 minutes.
Multiples: 15, 30, 45, 60, 75. 5/80 or 1/16