PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, W and X. The total number of stationery in Box W is thrice the total number of stationery in Box X.
- Find the percentage of notebooks in Box W.
- What fraction of stationery in Box X is notebooks?
- The number of notebooks in Box W is 135. Find the number of notebooks in Box X.
(a)
90°360° = 25% of stationery in Box W
Percentage of pencils in Box W = 25%
Percentage of notebooks in Box W
= 100% - 30% - 25%
= 45%
(b)
Percentage of notebooks in Box X
= 100% - 55% - 20%
= 25%
Fraction of stationery in Box X that is notebooks
= 25100
=
14 (c)
45% of stationery in Box W = 135
1% of stationery in Box W = 135 ÷ 45 = 3
100% of the stationery in Box W = 100 x 3 = 300
Number of stationery in Box X
= 300 ÷ 3
= 100
100% of stationery in Box X = 100
1% of stationery in Box W = 100 ÷ 100 = 1
25% of stationery in Box W = 25 x 1 = 25
Number of notebooks in Box X = 25
Answer(s): (a) 45%; (b)
14; (c) 25