A gumball machine has 130 red gumballs. If the red gumballs are 25% of the total number of gumballs, how many gumballs are in the gumball machine?
If the red gumballs are 25% of the total number of gumballs, then the total number of gumballs is:
130 / 0.25 = 520
Therefore, there are 520 gumballs in the gumball machine.