On Thursday, Warren read ²₇ of a textbook. On Friday, he read 25 pages of the textbook. On Saturday, he read ³₅ of the remaining book leaving 24 pages unread.

1. Find the number of pages read on Saturday.
2. Find the total number of pages in the textbook.

(a)
Number of remaining unread pages after reading on Friday = 5 u

Number of remaining unread pages after reading on Saturday
= 5 u - 3 u
= 2 u

2 u = 24

1 u = 24 ÷ 2 = 12

Number of pages that Warren read on Saturday
= 3 u
= 3 x 12
= 36

(b) 
Working backwards.

Number of pages unread after reading on Friday
= 5 u
= 5 x 12
= 60

Total number of pages in the textbook = 7 p

Number of pages unread after reading on Thursday 
= 7 p - 2 p
= 5 p

5 p = 25 + 60
5 p = 85

1 p = 85 ÷ 5 = 17

Total number of pages in the textbook
= 7 p
= 7 x 17
= 119

Answer(s): (a) 36; (b) 119