PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, A and B. The total number of stationery in Box A is thrice the total number of stationery in Box B.
- Find the percentage of punchers in Box A.
- What fraction of stationery in Box B is punchers?
- The number of punchers in Box A is 90. Find the number of punchers in Box B.
(a)
90°360° = 25% of stationery in Box A
Percentage of pens in Box A = 25%
Percentage of punchers in Box A
= 100% - 45% - 25%
= 30%
(b)
Percentage of punchers in Box B
= 100% - 50% - 20%
= 30%
Fraction of stationery in Box B that is punchers
= 30100
=
310 (c)
30% of stationery in Box A = 90
1% of stationery in Box A = 90 ÷ 30 = 3
100% of the stationery in Box A = 100 x 3 = 300
Number of stationery in Box B
= 300 ÷ 3
= 100
100% of stationery in Box B = 100
1% of stationery in Box A = 100 ÷ 100 = 1
30% of stationery in Box A = 30 x 1 = 30
Number of punchers in Box B = 30
Answer(s): (a) 30%; (b)
310; (c) 30