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

1. Find the percentage of folders in Box P.
2. What fraction of stationery in Box Q is folders?
3. The number of folders in Box P is 405. Find the number of folders in Box Q.

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

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

Percentage of folders in Box P
= 100% - 30% - 25%
= 45%

(b)
Percentage of folders in Box Q
= 100% - 35% - 30%
= 35%

Fraction of stationery in Box Q that is folders
= ⁷₂₀

(c)
45% of stationery in Box P = 405
1% of stationery in Box P = 405 ÷ 45 = 9 
100% of the stationery in Box P = 100 x 9 = 900

Number of stationery in Box Q
= 900 ÷ 3
= 300

100% of stationery in Box Q = 300
1% of stationery in Box P = 300 ÷ 100 = 3
35% of stationery in Box P = 35 x 3 = 105  

Number of folders in Box Q = 105

Answer(s): (a) 45%; (b) ⁷₂₀; (c) 105