Question

450 is 75% is of what number

Answer 1

450 is 75% of what
This translates to..
450=0.75 x ? 
Basically means 
450=0.75x
To solve for x you would divide both sides by 0.75
450/0.75=600
0.75/0.75=x
x=600 <--our FINAL answer 

Answer 2

450 is 75% of 600

Convert your percentage to a decimal by taking it and dividing it by 100: 75%/100 = 0.75

Since 0.75 is our decimal, take 450 and divide it by the decimal to get the answer: 450 ÷ 0.75 = 600