PSLE
The pie charts show the number of each type of stationery in 2 stationery boxes, A and B. The total number of stationery in Box A is five times the total number of stationery in Box B.

1. Find the percentage of rulers in Box A.
2. What fraction of stationery in Box B is rulers?
3. The number of rulers in Box A is 200. Find the number of rulers in Box B.

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

Percentage of markers in Box A = 25%

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

(b)
Percentage of rulers in Box B
= 100% - 60% - 30%
= 10%

Fraction of stationery in Box B that is rulers
= ¹₁₀

(c)
20% of stationery in Box A = 200
1% of stationery in Box A = 200 ÷ 20 = 10 
100% of the stationery in Box A = 100 x 10 = 1000

Number of stationery in Box B
= 1000 ÷ 5
= 200

100% of stationery in Box B = 200
1% of stationery in Box A = 200 ÷ 100 = 2
10% of stationery in Box A = 10 x 2 = 20  

Number of rulers in Box B = 20

Answer(s): (a) 20%; (b) ¹₁₀; (c) 20