Question

There is a spinner with 12 equal areas, numbered 1 through 12. If the spinner is spun one time, what is the probability that the result is a multiple of 2 and a multiple of 5?

Answer 1

Multiples of both 2 and 5 are multiples of lcm(2,5)=10. Among 1–12 only 10 qualifies, so probability = 1/12.