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

1. Half of the notebooks sold by Shop U were blue notebooks. How many blue notebooks did Shop U sell?
2. Which colour(s) of notebooks did Shop U sell less than Shop V? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In April, Shop V sold 20 more yellow notebooks than the number of yellow notebooks sold in March. What was the percentage increase in the number of yellow notebooks sold by Shop V from March to April?

(a)
Number of yellow notebooks sold in Shop U = 45
Number of orange notebooks sold in Shop U = 40
Number of green notebooks sold in Shop U = 5

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

Number of blue notebooks sold in Shop U
= 45 + 40 + 5
= 90

(b)
Number of yellow notebooks sold in Shop U = 45 (More)
Number of yellow notebooks sold in Shop V = 25

Number of orange notebooks sold in Shop U = 40 (Equal)
Number of orange notebooks sold in Shop V = 40

Number of green notebooks sold in Shop U = 5 (Less) 
Number of green notebooks sold in Shop V = 50

Number of blue notebooks sold in Shop U = 90 (More) 
Number of blue notebooks sold in Shop V = 50 

Colour(s) of notebooks that Shop U sold less than Shop V = Green (G)

(c)
Percentage increase in the number of yellow notebooks sold by Shop V from March to April
= ²⁰₂₅ x 100%
= ⁴₅ x 100%
= 80%

Answer(s): (a) 90; (b) G; (c) 80%