Question

Alex runs every 9 days and swims every 12 days. If he ran and swam today, how many days until he does both activities on the same day again?

Answer 1

• Alex runs in every 9 days
• Alex swims in every 12 days

We have to find LCM of 9 and 12

2 | 9,12

2 | 9,6

3 | 9,3

3 | 3,1

LCM=2×2×3×3=4×9=36

Today is 36 th day

Answer 2

36 days

Explanation:

The answer is the lcm of (9,12)=36 days