PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, M and N. The total number of stationery in Box M is thrice the total number of stationery in Box N.
- Find the percentage of rulers in Box M.
- What fraction of stationery in Box N is rulers?
- The number of rulers in Box M is 120. Find the number of rulers in Box N.
(a)
90°360° = 25% of stationery in Box M
Percentage of punchers in Box M = 25%
Percentage of rulers in Box M
= 100% - 55% - 25%
= 20%
(b)
Percentage of rulers in Box N
= 100% - 55% - 20%
= 25%
Fraction of stationery in Box N that is rulers
= 25100
=
14 (c)
20% of stationery in Box M = 120
1% of stationery in Box M = 120 ÷ 20 = 6
100% of the stationery in Box M = 100 x 6 = 600
Number of stationery in Box N
= 600 ÷ 3
= 200
100% of stationery in Box N = 200
1% of stationery in Box M = 200 ÷ 100 = 2
25% of stationery in Box M = 25 x 2 = 50
Number of rulers in Box N = 50
Answer(s): (a) 20%; (b)
14; (c) 50