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

1. Half of the notebooks sold by Shop T were pink notebooks. How many pink notebooks did Shop T sell?
2. Which colour(s) of notebooks did Shop T sell less than Shop U? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In August, Shop U sold 5 more purple notebooks than the number of purple notebooks sold in July. What was the percentage increase in the number of purple notebooks sold by Shop U from July to August?

(a)
Number of purple notebooks sold in Shop T = 140
Number of blue notebooks sold in Shop T = 120
Number of orange notebooks sold in Shop T = 40

Since pink notebooks sold in Shop T is half of the notebooks sold by Shop T, the total of purple notebooks, blue notebooks and orange notebooks is equal to pink notebooks.

Number of pink notebooks sold in Shop T
= 140 + 120 + 40
= 300

(b)
Number of purple notebooks sold in Shop T = 140 (More)
Number of purple notebooks sold in Shop U = 20

Number of blue notebooks sold in Shop T = 120 (Equal)
Number of blue notebooks sold in Shop U = 120

Number of orange notebooks sold in Shop T = 40 (Less) 
Number of orange notebooks sold in Shop U = 180

Number of pink notebooks sold in Shop T = 300 (More) 
Number of pink notebooks sold in Shop U = 160 

Colour(s) of notebooks that Shop T sold less than Shop U = Orange (O)

(c)
Percentage increase in the number of purple notebooks sold by Shop U from July to August
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 300; (b) O; (c) 25%