PSLEBooks in a class library are grouped according to the following four types: Romance, Comic, Computer, and History. 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 Romance type?
- There were 42 pupils in the class. Every pupil in the class took two or six books home to read over the weekend. No book was left in the classroom. How many pupils took six books home?
(a)
Total number of books
= 42 + 13 + 39 + 26
= 120
Percentage of books that was Romance
=
42120 x 100%
=
720 x 100%
= 35%
(b)
Number of pupils who took 6 books |
Number of books taken |
Number of pupils who took 2 books |
Number of books taken |
Total number of books taken |
42 |
42 x 6 = 252 |
0 |
0 |
252 |
41 |
41 x 6 = 246 |
1 |
2 |
248 |
Difference in the number of books if 1 more student takes 2 books instead of 6
= 252 - 248
= 4
Total difference in the number of books taken
= 252 - 120
= 132
Number of pupils who took two books home
= 132 ÷ 4
= 33
Number of pupils who took six books home
= 42 - 33
= 9
Answer(s): (a) 35%; (b) 9