If 30 is 20 percent of a number, then the number is what percent of 30?

Percent means parts out of 100 so 20% means 20/100

short version, longer version below

20%=1/5

30=1/5

5/5 is 5 times of 1/5

500%=5 times

number is 500% of 30

longer explanation

30=20/100 of a number

30=2/10 of a number

30=1/5 of a number

multiply both sides by 5

150=5/5 of a number

30=1/5 of 150

100% means 1 times

200% = 2 times

500%=5 times

150 is 500% of 30