PSLE
Stores B and C sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in April. The bar for the number blue rulers sold by Store B has not been drawn.

1. Half of the rulers sold by Store B were blue rulers. How many blue rulers did Store B sell?
2. Which colour(s) of rulers did Store B sell less than Store C? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In May, Store C sold 15 less pink rulers than the number of pink rulers sold in April. What was the percentage increase in the number of pink rulers sold by Store C from April to May?

(a)
Number of orange rulers sold in Store B = 20
Number of pink rulers sold in Store B = 120
Number of yellow rulers sold in Store B = 200

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

Number of blue rulers sold in Store B
= 120 + 200 + 20
= 340

(b)
Number of orange rulers sold in Store B = 20 (Less) 
Number of orange rulers sold in Store C = 120

Number of pink rulers sold in Store B = 120 (More)
Number of pink rulers sold in Store C = 60

Number of yellow rulers sold in Store B = 200 (Equal)
Number of yellow rulers sold in Store C = 200

Number of blue rulers sold in Store B = 340 (More) 
Number of blue rulers sold in Store C = 120 

Colour(s) of rulers that Store B sold less than Store C = Orange (O)

(c)
Percentage decrease in the number of pink rulers sold by Store C from April to May
= ¹⁵₆₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 340; (b) O; (c) 25%