The page they will be on is 225.
The page that both Juan and Houa would be on at the end of the month is a function of the page they are at the beginning of the month and the page they read per day.
Pages they are in t days:
J = 45 + 15t
H = 9 + 18t
When they are on the same page, both equations would be equal
45 + 15t = 9 + 18t
45 - 9 = 18t - 15t
36 = 3t
t = 36 / 3
t = 12
Page they would be in 12 days: 45 + 15(12)
45 + 180 = 225
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