If there are 500 seats in the theatre . 7/10 seats are filled . how many are empty??

1 - 7 / 10 = 10 / 10 - 7 / 10 = 3 / 10

are empty

3 / 10 • 500 = 3 • 500 / 10 =

1500 / 10 = 150

seats are empty