PSLE
Shops P and Q sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in July. The bar for the number yellow notebooks sold by Shop P has not been drawn.

1. Half of the notebooks sold by Shop P were yellow notebooks. How many yellow notebooks did Shop P sell?
2. Which colour(s) of notebooks did Shop P sell less than Shop Q? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In August, Shop Q sold 15 more green notebooks than the number of green notebooks sold in July. What was the percentage increase in the number of green notebooks sold by Shop Q from July to August?

(a)
Number of green notebooks sold in Shop P = 120
Number of orange notebooks sold in Shop P = 120
Number of pink notebooks sold in Shop P = 60

Since yellow notebooks sold in Shop P is half of the notebooks sold by Shop P, the total of green notebooks, orange notebooks and pink notebooks is equal to yellow notebooks.

Number of yellow notebooks sold in Shop P
= 120 + 120 + 60
= 300

(b)
Number of green notebooks sold in Shop P = 120 (More)
Number of green notebooks sold in Shop Q = 100

Number of orange notebooks sold in Shop P = 120 (Equal)
Number of orange notebooks sold in Shop Q = 120

Number of pink notebooks sold in Shop P = 60 (Less) 
Number of pink notebooks sold in Shop Q = 120

Number of yellow notebooks sold in Shop P = 300 (More) 
Number of yellow notebooks sold in Shop Q = 180 

Colour(s) of notebooks that Shop P sold less than Shop Q = Pink (P)

(c)
Percentage increase in the number of green notebooks sold by Shop Q from July to August
= ¹⁵₁₀₀ x 100%
= ³₂₀ x 100%
= 15%

Answer(s): (a) 300; (b) P; (c) 15%