On Wednesday, Rael read
58 of a textbook. On Thursday, he read 34 pages of the textbook. On Friday, he read
35 of the remaining book leaving 8 pages unread.
- Find the number of pages read on Friday.
- Find the total number of pages in the textbook.
(a)
Number of remaining unread pages after reading on Thursday = 5 u
Number of remaining unread pages after reading on Friday
= 5 u - 3 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Number of pages that Rael read on Friday
= 3 u
= 3 x 4
= 12
(b)
Working backwards.
Number of pages unread after reading on Thursday
= 5 u
= 5 x 4
= 20
Total number of pages in the textbook = 8 p
Number of pages unread after reading on Wednesday
= 8 p - 5 p
= 3 p
3 p = 34 + 20
3 p = 54
1 p = 54 ÷ 3 = 18
Total number of pages in the textbook
= 8 p
= 8 x 18
= 144
Answer(s): (a) 12; (b) 144