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

1. Find the percentage of files in Box J.
2. What fraction of stationery in Box K is files?
3. The number of files in Box J is 80. Find the number of files in Box K.

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

Percentage of punchers in Box J = 25%

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

(b)
Percentage of files in Box K
= 100% - 40% - 25%
= 35%

Fraction of stationery in Box K that is files
= ⁷₂₀

(c)
40% of stationery in Box J = 80
1% of stationery in Box J = 80 ÷ 40 = 2 
100% of the stationery in Box J = 100 x 2 = 200

Number of stationery in Box K
= 200 ÷ 2
= 100

100% of stationery in Box K = 100
1% of stationery in Box J = 100 ÷ 100 = 1
35% of stationery in Box J = 35 x 1 = 35  

Number of files in Box K = 35

Answer(s): (a) 40%; (b) ⁷₂₀; (c) 35