PSLEBooks in a class library are grouped according to the following four types: Comic, Self-help, History, and Mystery. The bar graph shows the number of books of each type in the class library.
- What percentage of books in the class library was of the History type?
- There were 35 pupils in the class. Every pupil in the class took two or five books home to read over the weekend. No book was left in the classroom. How many pupils took two books home?
(a)
Total number of books
= 40 + 15 + 12 + 33
= 100
Percentage of books that was History
=
12100 x 100%
=
325 x 100%
= 12%
(b)
Number of pupils who took 5 books |
Number of books taken |
Number of pupils who took 2 books |
Number of books taken |
Total number of books taken |
35 |
35 x 5 = 175 |
0 |
0 |
175 |
34 |
34 x 5 = 170 |
1 |
2 |
172 |
Difference in the number of books taken if 1 more student takes 2 books instead of 5
= 175 - 172
= 3
Total difference in the number of books taken
= 175 - 100
= 75
Number of pupils who took two books home
= 75 ÷ 3
= 25
Answer(s): (a) 12%; (b) 25