Question

A spinner is divided into many sections of equal size. Some sections are red, some are blue, and the remaining are green. The probability of the arrow landing on a section colored red is 12 over 20. The probability of the arrow landing on a section colored blue is 6 over 20. What is the probability of the arrow landing on a green-colored section?
2 over 20
6 over 20
8 over 20
18 over 20

Answer 1

2/20 since the red and he blue section adds up to 18/20. So what is left would be green (2/20).