PSLE
The 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 twice the total number of stationery in Box S.

1. Find the percentage of files in Box R.
2. What fraction of stationery in Box S is files?
3. The number of files in Box R is 350. Find the number of files in Box S.

(a)
^90°_360° = 25% of stationery in Box R

Percentage of foolscaps in Box R = 25%

Percentage of files in Box R
= 100% - 40% - 25%
= 35%

(b)
Percentage of files in Box S
= 100% - 50% - 25%
= 25%

Fraction of stationery in Box S that is files
= ¹₄

(c)
35% of stationery in Box R = 350
1% of stationery in Box R = 350 ÷ 35 = 10 
100% of the stationery in Box R = 100 x 10 = 1000

Number of stationery in Box S
= 1000 ÷ 2
= 500

100% of stationery in Box S = 500
1% of stationery in Box R = 500 ÷ 100 = 5
25% of stationery in Box R = 25 x 5 = 125  

Number of files in Box S = 125

Answer(s): (a) 35%; (b) ¹₄; (c) 125