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

1. Find the percentage of files in Box H.
2. What fraction of stationery in Box J is files?
3. The number of files in Box H is 60. Find the number of files in Box J.

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

Percentage of post-it pads in Box H = 25%

Percentage of files in Box H
= 100% - 55% - 25%
= 20%

(b)
Percentage of files in Box J
= 100% - 55% - 20%
= 25%

Fraction of stationery in Box J that is files
= ¹₄

(c)
20% of stationery in Box H = 60
1% of stationery in Box H = 60 ÷ 20 = 3 
100% of the stationery in Box H = 100 x 3 = 300

Number of stationery in Box J
= 300 ÷ 3
= 100

100% of stationery in Box J = 100
1% of stationery in Box H = 100 ÷ 100 = 1
25% of stationery in Box H = 25 x 1 = 25  

Number of files in Box J = 25

Answer(s): (a) 20%; (b) ¹₄; (c) 25