Noe take 5 minutes to rides his to down the hill to school and 10 minutes to rides up the hill from school Monday though Friday.
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Starting from what I know (the difference between ribbons), I decided to go from the bottom and work my way up. I then noticed a pattern (each sum was three more of the previous one), and decided to keep my pattern of the three numbers but not have to do any major mental work and instead add three to the previous sum until I got to 38.
