3) What percent of 104 hours is 20 hours?

x = percentage (eg: if x = 3 then this represents 3%)

x/100 = decimal form of the percentage (eg: if x = 3 then x/100 = 3/100 = 0.03)

The equation to solve is

x/100 = 20/104

Cross multiply to get

104x = 100*20

104x = 2000

Then divide both sides by 104 to isolate x

104x/104 = 2000/104

x = 2000/104

x = 19.230769

x = 19.23

So the answer is approximately 19.23%