Sunny read a book with 450 pages last week. First, she read 1/5 of the book on Monday. Then she read same number of pages each day since Tuesday, and she finished reading the whole book on Thursday. How many pages did she read on Tuesday?
Sunny read 1/5 of the book on Monday, which is (1/5) * 450 = 90 pages.
Let x be the number of pages she read on Tuesday.
Since she read the same number of pages each day since Tuesday, she read x pages on Tuesday, x pages on Wednesday, and x pages on Thursday.
So, the total pages she read from Tuesday to Thursday is 3x.
Given that she read the whole book by Thursday, the total pages she read from Tuesday to Thursday is 450 - 90 = 360 pages.
Therefore, 3x = 360.
Divide both sides by 3 to solve for x:
x = 360 / 3 = 120 pages.
Sunny read 120 pages on Tuesday.