Answer:
10 years for b and 3 years for a
Step-by-step explanation:
you have to find the common mutiples of 25 and 9, once you do you have to find the common one, the ones that are the same. and then count how many times you jump counted.
25: 25, 50, 75, 100, 125
9: 9, 18, 27, 36, 45, 54, 64, 73, 82, 91, 100
