PSLE
Stationery Kiosks Q and R sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in March. The bar for the number orange notebooks sold by Stationery Kiosk Q has not been drawn.

1. Half of the notebooks sold by Stationery Kiosk Q were orange notebooks. How many orange notebooks did Stationery Kiosk Q sell?
2. Which colour(s) of notebooks did Stationery Kiosk Q sell less than Stationery Kiosk R? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In April, Stationery Kiosk R sold 30 more green notebooks than the number of green notebooks sold in March. What was the percentage increase in the number of green notebooks sold by Stationery Kiosk R from March to April?

(a)
Number of green notebooks sold in Stationery Kiosk Q = 70
Number of pink notebooks sold in Stationery Kiosk Q = 60
Number of blue notebooks sold in Stationery Kiosk Q = 20

Since orange notebooks sold in Stationery Kiosk Q is half of the notebooks sold by Stationery Kiosk Q, the total of green notebooks, pink notebooks and blue notebooks is equal to orange notebooks.

Number of orange notebooks sold in Stationery Kiosk Q
= 70 + 60 + 20
= 150

(b)
Number of green notebooks sold in Stationery Kiosk Q = 70 (More)
Number of green notebooks sold in Stationery Kiosk R = 50

Number of pink notebooks sold in Stationery Kiosk Q = 60 (Equal)
Number of pink notebooks sold in Stationery Kiosk R = 60

Number of blue notebooks sold in Stationery Kiosk Q = 20 (Less) 
Number of blue notebooks sold in Stationery Kiosk R = 70

Number of orange notebooks sold in Stationery Kiosk Q = 150 (More) 
Number of orange notebooks sold in Stationery Kiosk R = 90 

Colour(s) of notebooks that Stationery Kiosk Q sold less than Stationery Kiosk R = Blue (B)

(c)
Percentage increase in the number of green notebooks sold by Stationery Kiosk R from March to April
= ³⁰₅₀ x 100%
= ³₅ x 100%
= 60%

Answer(s): (a) 150; (b) B; (c) 60%