Question 394276: every 5 days Alma rides her skateboard in the park. Every 4 days she rides her bike to her friend's house.How often does Alma do both?
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! I could say that on a certain day, she starts counting days
and, on the 4th day, she rides her bike. The next day, on the 5th day
from the start day, she skateboards.
The continuing counts are:
8 days -bike
10 days - skateboard
-----------------
12 days - bike
15 days skateboard
-----------------
16 days - bike
20 days - skateboard
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20 days - bike
That's as far as I need to go. On the 20th day after she starts
counting, she does both
Now, every 20 days she does both
Notice 20 is the smallest number that is evenly
divisible by both 4 and 5
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