PSLE
The pie charts show the number of each type of stationery in 2 stationery boxes, K and L. The total number of stationery in Box K is four times the total number of stationery in Box L.

1. Find the percentage of files in Box K.
2. What fraction of stationery in Box L is files?
3. The number of files in Box K is 240. Find the number of files in Box L.

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

Percentage of rulers in Box K = 25%

Percentage of files in Box K
= 100% - 45% - 25%
= 30%

(b)
Percentage of files in Box L
= 100% - 60% - 20%
= 20%

Fraction of stationery in Box L that is files
= ¹₅

(c)
30% of stationery in Box K = 240
1% of stationery in Box K = 240 ÷ 30 = 8 
100% of the stationery in Box K = 100 x 8 = 800

Number of stationery in Box L
= 800 ÷ 4
= 200

100% of stationery in Box L = 200
1% of stationery in Box K = 200 ÷ 100 = 2
20% of stationery in Box K = 20 x 2 = 40  

Number of files in Box L = 40

Answer(s): (a) 30%; (b) ¹₅; (c) 40