Question

Scott must choose a number between 67 and 113 that is a multiple of 5, 8, and 10. Write all the numbers that he could choose. If there is more than one number, separate them with commas.

Answer 1

Numbers need to be between 67 and 113

Start with the biggest multiple:
Multiples of 10: 70, 80, 90, 100, 110

All multiples of 10 are multiples of 5 [skip]

From multiples of 10, I check if they are multiple of 8:
70 (no)
80 (yes, 8 x10 = 80)
90 (no)
100 (no)
110 (no)

The answer is 80