7 14 21 28 35 42 49 56 63 70
Need to be double digits, so remove 7:
14 21 28 35 42 49 56 63 70
One needs to be odd and one need to be even so separate the numbers into odds and evens:
Even: 14, 28, 42, 56, 70
Odd: 21, 35, 49, 63
70/14 = 5
70 /35 = 2
The two numbers are 14 and 35
