PSLE
Stores Q and R sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in July. The bar for the number orange rulers sold by Store Q has not been drawn.

1. Half of the rulers sold by Store Q were orange rulers. How many orange rulers did Store Q sell?
2. Which colour(s) of rulers did Store Q sell less than Store R? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In August, Store R sold 20 more green rulers than the number of green rulers sold in July. What was the percentage increase in the number of green rulers sold by Store R from July to August?

(a)
Number of green rulers sold in Store Q = 200
Number of blue rulers sold in Store Q = 150
Number of purple rulers sold in Store Q = 75

Since orange rulers sold in Store Q is half of the rulers sold by Store Q, the total of green rulers, blue rulers and purple rulers is equal to orange rulers.

Number of orange rulers sold in Store Q
= 200 + 150 + 75
= 425

(b)
Number of green rulers sold in Store Q = 200 (More)
Number of green rulers sold in Store R = 100

Number of blue rulers sold in Store Q = 150 (Equal)
Number of blue rulers sold in Store R = 150

Number of purple rulers sold in Store Q = 75 (Less) 
Number of purple rulers sold in Store R = 200

Number of orange rulers sold in Store Q = 425 (More) 
Number of orange rulers sold in Store R = 175 

Colour(s) of rulers that Store Q sold less than Store R = Purple (P)

(c)
Percentage increase in the number of green rulers sold by Store R from July to August
= ²⁰₁₀₀ x 100%
= ¹₅ x 100%
= 20%

Answer(s): (a) 425; (b) P; (c) 20%