Question

if 18 is 45% of value, what is that value

Answer 1

the value is 40

to find the value divide 18 by .45 (45%=.45)

Answer 2

percent  is parts out of 100 so
45%=45/100=9/20
'of' means multiply
18 =9/20 times something
multiply both sides by 20/9 to clear fraction
360/9=something
40=something

the value is 40