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

1. Find the percentage of post-it pads in Box S.
2. What fraction of stationery in Box T is post-it pads?
3. The number of post-it pads in Box S is 70. Find the number of post-it pads in Box T.

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

Percentage of files in Box S = 25%

Percentage of post-it pads in Box S
= 100% - 40% - 25%
= 35%

(b)
Percentage of post-it pads in Box T
= 100% - 45% - 25%
= 30%

Fraction of stationery in Box T that is post-it pads
= ³₁₀

(c)
35% of stationery in Box S = 70
1% of stationery in Box S = 70 ÷ 35 = 2 
100% of the stationery in Box S = 100 x 2 = 200

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

100% of stationery in Box T = 100
1% of stationery in Box S = 100 ÷ 100 = 1
30% of stationery in Box S = 30 x 1 = 30  

Number of post-it pads in Box T = 30

Answer(s): (a) 35%; (b) ³₁₀; (c) 30