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

1. Find the percentage of rulers in Box D.
2. What fraction of stationery in Box E is rulers?
3. The number of rulers in Box D is 80. Find the number of rulers in Box E.

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

Percentage of correction tapes in Box D = 25%

Percentage of rulers in Box D
= 100% - 35% - 25%
= 40%

(b)
Percentage of rulers in Box E
= 100% - 40% - 25%
= 35%

Fraction of stationery in Box E that is rulers
= ⁷₂₀

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

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

100% of stationery in Box E = 100
1% of stationery in Box D = 100 ÷ 100 = 1
35% of stationery in Box D = 35 x 1 = 35  

Number of rulers in Box E = 35

Answer(s): (a) 40%; (b) ⁷₂₀; (c) 35