pls help i really need a math professional im struggling.

Answer:
20
Step-by-step explanation:
16/x = 80/100
16/x because 16 is your part and you are trying to find your whole (x)
80 is your part and 100 is your whole (this is from percent)
Cross multiply:
1600 = 80x
1600/80 = x
x = 20