PSLE
Stationery Kiosks W and X sell folders of four colours. The bar graphs show the number of folders sold by each shop in April. The bar for the number green folders sold by Stationery Kiosk W has not been drawn.

1. Half of the folders sold by Stationery Kiosk W were green folders. How many green folders did Stationery Kiosk W sell?
2. Which colour(s) of folders did Stationery Kiosk W sell less than Stationery Kiosk X? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In May, Stationery Kiosk X sold 5 more purple folders than the number of purple folders sold in April. What was the percentage increase in the number of purple folders sold by Stationery Kiosk X from April to May?

(a)
Number of purple folders sold in Stationery Kiosk W = 140
Number of orange folders sold in Stationery Kiosk W = 200
Number of pink folders sold in Stationery Kiosk W = 100

Since green folders sold in Stationery Kiosk W is half of the folders sold by Stationery Kiosk W, the total of purple folders, orange folders and pink folders is equal to green folders.

Number of green folders sold in Stationery Kiosk W
= 140 + 200 + 100
= 440

(b)
Number of purple folders sold in Stationery Kiosk W = 140 (More)
Number of purple folders sold in Stationery Kiosk X = 20

Number of orange folders sold in Stationery Kiosk W = 200 (Equal)
Number of orange folders sold in Stationery Kiosk X = 200

Number of pink folders sold in Stationery Kiosk W = 100 (Less) 
Number of pink folders sold in Stationery Kiosk X = 140

Number of green folders sold in Stationery Kiosk W = 440 (More) 
Number of green folders sold in Stationery Kiosk X = 100 

Colour(s) of folders that Stationery Kiosk W sold less than Stationery Kiosk X = Pink (P)

(c)
Percentage increase in the number of purple folders sold by Stationery Kiosk X from April to May
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 440; (b) P; (c) 25%