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

1. Find the percentage of punchers in Box Q.
2. What fraction of stationery in Box R is punchers?
3. The number of punchers in Box Q is 450. Find the number of punchers in Box R.

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

Percentage of notebooks in Box Q = 25%

Percentage of punchers in Box Q
= 100% - 30% - 25%
= 45%

(b)
Percentage of punchers in Box R
= 100% - 35% - 30%
= 35%

Fraction of stationery in Box R that is punchers
= ⁷₂₀

(c)
45% of stationery in Box Q = 450
1% of stationery in Box Q = 450 ÷ 45 = 10 
100% of the stationery in Box Q = 100 x 10 = 1000

Number of stationery in Box R
= 1000 ÷ 2
= 500

100% of stationery in Box R = 500
1% of stationery in Box Q = 500 ÷ 100 = 5
35% of stationery in Box Q = 35 x 5 = 175  

Number of punchers in Box R = 175

Answer(s): (a) 45%; (b) ⁷₂₀; (c) 175