Question

You are organizing party invitations. The stamps come in packs of 20. The invitations

come in packs of 15. What is the least number of stamps and invitations you can buy so
you have an even number of stamps and invitations?

Answer 1

255

Explanation:

You need the least common multiple (LCD) of 15 and 17.

The prime factorizations of 15 and 17 are

3 × 5

17

Since there are no common factors, the LCM is their product.

15 × 17 = 255

Answer: 255