You go to the grocery store every 4 days. your friend goes to the grocery store every 10 days. if you and your friend both go to the grocery store today, when will you both go to the grocery store again on the same day?
The answer for this question would be you will both go to
the store on the same day in 20 days. The reason behind this is you go every 4
days so at the time you go on your fifth round of those 4 days it would be your
friend's 2nd time shopping in your friend's 10 shopping days.
