PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, R and S. The total number of stationery in Box R is four times the total number of stationery in Box S.
- Find the percentage of files in Box R.
- What fraction of stationery in Box S is files?
- The number of files in Box R is 120. Find the number of files in Box S.
(a)
90°360° = 25% of stationery in Box R
Percentage of post-it pads in Box R = 25%
Percentage of files in Box R
= 100% - 45% - 25%
= 30%
(b)
Percentage of files in Box S
= 100% - 55% - 15%
= 30%
Fraction of stationery in Box S that is files
= 30100
=
310 (c)
30% of stationery in Box R = 120
1% of stationery in Box R = 120 ÷ 30 = 4
100% of the stationery in Box R = 100 x 4 = 400
Number of stationery in Box S
= 400 ÷ 4
= 100
100% of stationery in Box S = 100
1% of stationery in Box R = 100 ÷ 100 = 1
30% of stationery in Box R = 30 x 1 = 30
Number of files in Box S = 30
Answer(s): (a) 30%; (b)
310; (c) 30