Question

What is 20% of 90 with the work?

Answer 1

What you want to do is convert 20% into a decimal. Then you multiply that by 90. So, if 20% was a decimal(In this case it is 0.2) you do 0.2*90 which equals 18. So the answer is 18.

Answer 2

The easy way is:

covert 20% as a fraction

20/100=x/90 and solve it. 

the answer is.... 18