It must be 10.
10
Any multiple of 10 is a multiple of 5 and 10
A number with multiples 10 and 5 would not have a factor of 12. A single mystery number would not have a sum of 6. Under these conditions, the mystery number will remain a mystery.
1 and 5
5,631,683,557,500,000 is a multiple of 3 because its digits add up to a multiple of 3. It's a multiple of 5 because it ends in a zero. If it's a multiple of 3 and 5, it's a multiple of 15, so 15 is a factor of it.
10 is a multiple of 1,2,and 5
Any multiple of 40.
5 is a factor of 10.
Well the gfc for 5 and 10 is 5
1, 2, 5, 10
Every whole number that ends with ' 5 ' or ' 0 ' is a multiple of 5 . Every whole number that ends with ' 0 ' is a multiple of 10.