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

1. Find the percentage of pens in Box F.
2. What fraction of stationery in Box G is pens?
3. The number of pens in Box F is 40. Find the number of pens in Box G.

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

Percentage of punchers in Box F = 25%

Percentage of pens in Box F
= 100% - 55% - 25%
= 20%

(b)
Percentage of pens in Box G
= 100% - 45% - 25%
= 30%

Fraction of stationery in Box G that is pens
= ³₁₀

(c)
20% of stationery in Box F = 40
1% of stationery in Box F = 40 ÷ 20 = 2 
100% of the stationery in Box F = 100 x 2 = 200

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

100% of stationery in Box G = 100
1% of stationery in Box F = 100 ÷ 100 = 1
30% of stationery in Box F = 30 x 1 = 30  

Number of pens in Box G = 30

Answer(s): (a) 20%; (b) ³₁₀; (c) 30