mark goes to the mall every 4 days, costco every 2 days, and the grocery store every 3 days. if he goes to all three on the 15th, when will he go to all three again?

27th

Step-by-step explanation:

Every 4 days=4m

Every 3days=3s

Costco = 2c

When does 4m=D=3s?

When m=0=s and when m=3 and s=4

4•3=12=3•4

Can 2c=12? Yes, when c=6

So 12 days from now, mall, store and Costco will all happen.

15+12=27

Mark will go to all three again on the 27th.

You must find the least common multiple of 4, 2, and 3. That is, find the smallest number that is divisible by all three of the numbers. You get 12. 12 is divisible by 4, 2, and 3.

Finally, add 12 to the 15th to get the 27th.