A box contains 40 number tiles numbered 1 to 40. If a tile is drawn at random, what is the probability that the number drawn is a multiple of 3 or 4? Find P(Multiple of 4 or Multiple of 5)

P ( mult 3 or 4) =

P(mult of 3) + P(mult of 4) - P(mult 3 and 4) =

13/40 + 10/40 - 3/40 =

20 / 40 =

1 / 2

P ( mult 4 or 5) =

P ( mult 4) + P (mult 5) - P (mult 4 and 5) =

10/40 + 8/40 - 2/40 =

16 / 40 =

2 / 5