Question

Nathan bikes every 2 days and swims every 5 days. He biked October 2 and swam October 5th. On what day will be swim and bike on the same day? Either, the 4th, 8th, 10th, 12th, 15th, 20th.

Answer 1

On the 10th!

(I got it right on iready)

Answer 2

Answer: See explanation

Explanation:

To solve this, we have to calculate the lowest common multiple of 2 and 5. This will be:

Multiples of 2 = 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 ....

Multiples of 5 = 5, 10, 15, 20 ....

This means that he will swim and bike every 10th day together. This will be on the 10th, and 20th in October.