Hi there!
The answer to this question is 7/15.
Okay, so here's how to solve:
1/20 + 5/12
=
3/60 + 25/60
To get these you have to keep raising these numbers up till the denominators match.
Now add the numerators.
3+25 = 28.
Now we have 28/60.
Simplified down till it can't go any lower makes 7/15.
Hope this helped!