Just use the ladder method!
Write the numerator and denominator in the ladder
Divide until you can’t anymore is your numerator 3 is your denominator
4 20
Write the numerator and denominator in the ladder
Divide until you can’t anymore is your numerator 5 is your denominator
16 32
Write the numerator and denominator in the ladder
Divide until you can’t anymore is your numerator 2 is your denominator
6 15
9 18
4 12