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 rulers in Box W.
- What fraction of stationery in Box X is rulers?
- The number of rulers in Box W is 210. Find the number of rulers in Box X.
(a)
90°360° = 25% of stationery in Box W
Percentage of pens in Box W = 25%
Percentage of rulers in Box W
= 100% - 40% - 25%
= 35%
(b)
Percentage of rulers in Box X
= 100% - 60% - 25%
= 15%
Fraction of stationery in Box X that is rulers
= 15100
=
320 (c)
35% of stationery in Box W = 210
1% of stationery in Box W = 210 ÷ 35 = 6
100% of the stationery in Box W = 100 x 6 = 600
Number of stationery in Box X
= 600 ÷ 3
= 200
100% of stationery in Box X = 200
1% of stationery in Box W = 200 ÷ 100 = 2
15% of stationery in Box W = 15 x 2 = 30
Number of rulers in Box X = 30
Answer(s): (a) 35%; (b)
320; (c) 30