PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, V and W. The total number of stationery in Box V is twice the total number of stationery in Box W.
- Find the percentage of rulers in Box V.
- What fraction of stationery in Box W is rulers?
- The number of rulers in Box V is 320. Find the number of rulers in Box W.
(a)
90°360° = 25% of stationery in Box V
Percentage of pencils in Box V = 25%
Percentage of rulers in Box V
= 100% - 35% - 25%
= 40%
(b)
Percentage of rulers in Box W
= 100% - 35% - 30%
= 35%
Fraction of stationery in Box W that is rulers
= 35100
=
720 (c)
40% of stationery in Box V = 320
1% of stationery in Box V = 320 ÷ 40 = 8
100% of the stationery in Box V = 100 x 8 = 800
Number of stationery in Box W
= 800 ÷ 2
= 400
100% of stationery in Box W = 400
1% of stationery in Box V = 400 ÷ 100 = 4
35% of stationery in Box V = 35 x 4 = 140
Number of rulers in Box W = 140
Answer(s): (a) 40%; (b)
720; (c) 140