Question

Every 3 Days Marco fills up his car with gas. Every 8 Days he washes it. On what day will he fill his car and wash it

Answer 1

Okay. So to answer this question, let’s find the LCM of both numbers, which means listing the numbers that a number can go into evenly.

3: 3, 6, 9, 12, 15, 18, 21, 24, 27
8: 8, 16, 24, 32, 40

When you look at both of them, you see that they both have a multiple of 23. So Marco will fill his car with gas and wash his car on the 24th day.