12 is 25% of 48. Steps to solve "12 is 25 percent of what number?" We have, 25% × x = 12; or, 25 / 100 × x = 12; Multiplying both sides by 100 and dividing both sides by 25, we have x = 12 × 100 / 25; x = 48. If you are using a calculator, simply enter 12×100÷25, which will give you the answer. MathStep (Works offline)