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

1. Find the percentage of rulers in Box E.
2. What fraction of stationery in Box F is rulers?
3. The number of rulers in Box E is 160. Find the number of rulers in Box F.

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

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

Percentage of rulers in Box E
= 100% - 55% - 25%
= 20%

(b)
Percentage of rulers in Box F
= 100% - 55% - 25%
= 20%

Fraction of stationery in Box F that is rulers
= ¹₅

(c)
20% of stationery in Box E = 160
1% of stationery in Box E = 160 ÷ 20 = 8 
100% of the stationery in Box E = 100 x 8 = 800

Number of stationery in Box F
= 800 ÷ 2
= 400

100% of stationery in Box F = 400
1% of stationery in Box E = 400 ÷ 100 = 4
20% of stationery in Box E = 20 x 4 = 80  

Number of rulers in Box F = 80

Answer(s): (a) 20%; (b) ¹₅; (c) 80