PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, C and D. The total number of stationery in Box C is twice the total number of stationery in Box D.
- Find the percentage of notebooks in Box C.
- What fraction of stationery in Box D is notebooks?
- The number of notebooks in Box C is 80. Find the number of notebooks in Box D.
(a)
90°360° = 25% of stationery in Box C
Percentage of correction tapes in Box C = 25%
Percentage of notebooks in Box C
= 100% - 55% - 25%
= 20%
(b)
Percentage of notebooks in Box D
= 100% - 65% - 20%
= 15%
Fraction of stationery in Box D that is notebooks
= 15100
=
320 (c)
20% of stationery in Box C = 80
1% of stationery in Box C = 80 ÷ 20 = 4
100% of the stationery in Box C = 100 x 4 = 400
Number of stationery in Box D
= 400 ÷ 2
= 200
100% of stationery in Box D = 200
1% of stationery in Box C = 200 ÷ 100 = 2
15% of stationery in Box C = 15 x 2 = 30
Number of notebooks in Box D = 30
Answer(s): (a) 20%; (b)
320; (c) 30