Question

the gasoline gauge on a van initially read 1/4 full. When 15 gallons were added to the tank the gauge read 3/4 full. ho many more gallons are needed to fill the tank

Answer 1

IDK WHY R U ASKING ME

Answer 2

So it started with 1/4. When added 15 gallons, it became 3/4. Which means, 2/4 of the tank was filled with 15 gallons, which is half the tank.
Since half the tank was filled from 15 gallons, divide 15 gallons by 2, so you find how much gallons fills from a quarter. This works since half divided by 2 = a quarter.
15 gallons / 2 = 7.5 gallons.
You need 7.5 gallons more to fill the tank.

Answer 3

Thanks @PrinceMMQ