PSLE
Stores D and E sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in October. The bar for the number green rulers sold by Store D has not been drawn.

1. Half of the rulers sold by Store D were green rulers. How many green rulers did Store D sell?
2. Which colour(s) of rulers did Store D sell less than Store E? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In November, Store E sold 10 less orange rulers than the number of orange rulers sold in October. What was the percentage increase in the number of orange rulers sold by Store E from October to November?

(a)
Number of blue rulers sold in Store D = 50
Number of orange rulers sold in Store D = 225
Number of pink rulers sold in Store D = 225

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

Number of green rulers sold in Store D
= 225 + 225 + 50
= 500

(b)
Number of blue rulers sold in Store D = 50 (Less) 
Number of blue rulers sold in Store E = 175

Number of orange rulers sold in Store D = 225 (More)
Number of orange rulers sold in Store E = 125

Number of pink rulers sold in Store D = 225 (Equal)
Number of pink rulers sold in Store E = 225

Number of green rulers sold in Store D = 500 (More) 
Number of green rulers sold in Store E = 175 

Colour(s) of rulers that Store D sold less than Store E = Blue (B)

(c)
Percentage decrease in the number of orange rulers sold by Store E from October to November
= ¹⁰₁₂₅ x 100%
= ²₂₅ x 100%
= 8%

Answer(s): (a) 500; (b) B; (c) 8%