Explanation

450 is 15% of 3000

Steps to solve "450 is 15 percent of what number?"

We have, 15% × x = 450

or, 

15

100

 × x = 450

Multiplying both sides by 100 and dividing both sides by 15,

we have x = 450 × 

100

15

x = 3000

If you are using a calculator, simply enter 450×100÷15, which will give you the answer.