PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, L and M. The total number of stationery in Box L is five times the total number of stationery in Box M.
- Find the percentage of rulers in Box L.
- What fraction of stationery in Box M is rulers?
- The number of rulers in Box L is 150. Find the number of rulers in Box M.
(a)
90°360° = 25% of stationery in Box L
Percentage of pens in Box L = 25%
Percentage of rulers in Box L
= 100% - 45% - 25%
= 30%
(b)
Percentage of rulers in Box M
= 100% - 65% - 20%
= 15%
Fraction of stationery in Box M that is rulers
= 15100
=
320 (c)
30% of stationery in Box L = 150
1% of stationery in Box L = 150 ÷ 30 = 5
100% of the stationery in Box L = 100 x 5 = 500
Number of stationery in Box M
= 500 ÷ 5
= 100
100% of stationery in Box M = 100
1% of stationery in Box L = 100 ÷ 100 = 1
15% of stationery in Box L = 15 x 1 = 15
Number of rulers in Box M = 15
Answer(s): (a) 30%; (b)
320; (c) 15