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 punchers in Box M.
- What fraction of stationery in Box N is punchers?
- The number of punchers in Box M is 270. Find the number of punchers in Box N.
(a)
90°360° = 25% of stationery in Box M
Percentage of pens in Box M = 25%
Percentage of punchers in Box M
= 100% - 30% - 25%
= 45%
(b)
Percentage of punchers in Box N
= 100% - 50% - 30%
= 20%
Fraction of stationery in Box N that is punchers
= 20100
=
15 (c)
45% of stationery in Box M = 270
1% of stationery in Box M = 270 ÷ 45 = 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
20% of stationery in Box M = 20 x 2 = 40
Number of punchers in Box N = 40
Answer(s): (a) 45%; (b)
15; (c) 40