PSLE
The pie charts show the number of each type of stationery in 2 stationery boxes, T and U. The total number of stationery in Box T is four times the total number of stationery in Box U.

1. Find the percentage of folders in Box T.
2. What fraction of stationery in Box U is folders?
3. The number of folders in Box T is 360. Find the number of folders in Box U.

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

Percentage of files in Box T = 25%

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

(b)
Percentage of folders in Box U
= 100% - 55% - 30%
= 15%

Fraction of stationery in Box U that is folders
= ³₂₀

(c)
45% of stationery in Box T = 360
1% of stationery in Box T = 360 ÷ 45 = 8 
100% of the stationery in Box T = 100 x 8 = 800

Number of stationery in Box U
= 800 ÷ 4
= 200

100% of stationery in Box U = 200
1% of stationery in Box T = 200 ÷ 100 = 2
15% of stationery in Box T = 15 x 2 = 30  

Number of folders in Box U = 30

Answer(s): (a) 45%; (b) ³₂₀; (c) 30