Probability - General Questions

One card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that it is a spade or an ace?

One card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that it is a heart?

A number is chosen at random from 1 to 20. What is the probability that it is a multiple of 6?

A number is chosen at random from 1 to 40. What is the probability that it is a multiple of 5?

A letter is chosen at random from the word 'MONDAY'. What is the probability that it is a vowel?