What Percent Of 84 Is 21?

We can find the answer to this question by first converting the statement into an equation.

Let's suppose that 21 is z percent of 81. So, we can say that:

z x 84 = 21
100

Now, we will simply solve this equation for z to obtain our answer:

z x 84 = 21
100

84z/100 = 21
84z = 21x100
84z = 2100
z = 2100/84
z = 25

Our answer:

21 is 25% of 84.

Let the value is x%
then, (x*84)/100 = 21
x = (21*100)/84
x = 25