Question

16 is 20% of what number?

Answer 1

80 because 16 divided by 20%
of means multiply but in this case divide

Answer 2

Set up a proportion first using this formula:
number/100 = is/of (they are set up like fractions)

Plug corresponding values into equation:
20/100 = 16/x (or whatever variable you choose)

Cross multiply the values:
20 * x and 100 *16

Set the resulting products equal to each other:
20x=1600

Isolate the variable by dividing the value in front of it by both sides:
20x/20 and 1600/20

Set the variable equal to the resulting value:
x=80

Check answer by plugging the solution into the original equation:
20/100 = 16/80

Determine if the values of each side are equal to each other. If so, the solution is correct:
0.2=0.2

Solution is correct!

16 is 20% of 80

Hope this helps :)