Rose read 1/3 of a book in the morning, and she read some more at night. By the end of the day, she still has 1/5 of the book left to read. How much of the book did Rose read at night?
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If she had 1/ 5 of the book left, she read a total of 4/5 so far
1/3 + n = 4/5 n = amount she read at night
n = 4/5 - 1/3
= 12/15 - 5 /15 = 7/15