Find the sum of all the common multiples of 2 and 5 that are less than 31.
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
Multiples of 5: 5, 10, 15, 20, 25, 30
Common multiples of 2 and 5: 10, 20, 30
Sum of all the common multiples of 2 and 5 that are less than 31
= 10 + 20 + 30
= 60
Answer(s): 60
