PSLE
Stores U and V sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in April. The bar for the number green notebooks sold by Store U has not been drawn.

1. Half of the notebooks sold by Store U were green notebooks. How many green notebooks did Store U sell?
2. Which colour(s) of notebooks did Store U sell less than Store V? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In May, Store V sold 45 more blue notebooks than the number of blue notebooks sold in April. What was the percentage increase in the number of blue notebooks sold by Store V from April to May?

(a)
Number of blue notebooks sold in Store U = 70
Number of pink notebooks sold in Store U = 70
Number of orange notebooks sold in Store U = 10

Since green notebooks sold in Store U is half of the notebooks sold by Store U, the total of blue notebooks, pink notebooks and orange notebooks is equal to green notebooks.

Number of green notebooks sold in Store U
= 70 + 70 + 10
= 150

(b)
Number of blue notebooks sold in Store U = 70 (More)
Number of blue notebooks sold in Store V = 50

Number of pink notebooks sold in Store U = 70 (Equal)
Number of pink notebooks sold in Store V = 70

Number of orange notebooks sold in Store U = 10 (Less) 
Number of orange notebooks sold in Store V = 60

Number of green notebooks sold in Store U = 150 (More) 
Number of green notebooks sold in Store V = 100 

Colour(s) of notebooks that Store U sold less than Store V = Orange (O)

(c)
Percentage increase in the number of blue notebooks sold by Store V from April to May
= ⁴⁵₅₀ x 100%
= ⁹₁₀ x 100%
= 90%

Answer(s): (a) 150; (b) O; (c) 90%