PSLE
Stationery Kiosks K and L sell folders of four colours. The bar graphs show the number of folders sold by each shop in June. The bar for the number blue folders sold by Stationery Kiosk K has not been drawn.

1. Half of the folders sold by Stationery Kiosk K were blue folders. How many blue folders did Stationery Kiosk K sell?
2. Which colour(s) of folders did Stationery Kiosk K sell less than Stationery Kiosk L? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Stationery Kiosk L sold 10 less green folders than the number of green folders sold in June. What was the percentage increase in the number of green folders sold by Stationery Kiosk L from June to July?

(a)
Number of orange folders sold in Stationery Kiosk K = 10
Number of green folders sold in Stationery Kiosk K = 45
Number of purple folders sold in Stationery Kiosk K = 30

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

Number of blue folders sold in Stationery Kiosk K
= 45 + 30 + 10
= 85

(b)
Number of orange folders sold in Stationery Kiosk K = 10 (Less) 
Number of orange folders sold in Stationery Kiosk L = 30

Number of green folders sold in Stationery Kiosk K = 45 (More)
Number of green folders sold in Stationery Kiosk L = 20

Number of purple folders sold in Stationery Kiosk K = 30 (Equal)
Number of purple folders sold in Stationery Kiosk L = 30

Number of blue folders sold in Stationery Kiosk K = 85 (More) 
Number of blue folders sold in Stationery Kiosk L = 30 

Colour(s) of folders that Stationery Kiosk K sold less than Stationery Kiosk L = Orange (O)

(c)
Percentage decrease in the number of green folders sold by Stationery Kiosk L from June to July
= ¹⁰₂₀ x 100%
= ¹₂ x 100%
= 50%

Answer(s): (a) 85; (b) O; (c) 50%