PSLE
Bookstores B and C sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in May. The bar for the number pink rulers sold by Bookstore B has not been drawn.

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

(a)
Number of yellow rulers sold in Bookstore B = 50
Number of orange rulers sold in Bookstore B = 175
Number of blue rulers sold in Bookstore B = 250

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

Number of pink rulers sold in Bookstore B
= 175 + 250 + 50
= 475

(b)
Number of yellow rulers sold in Bookstore B = 50 (Less) 
Number of yellow rulers sold in Bookstore C = 150

Number of orange rulers sold in Bookstore B = 175 (More)
Number of orange rulers sold in Bookstore C = 125

Number of blue rulers sold in Bookstore B = 250 (Equal)
Number of blue rulers sold in Bookstore C = 250

Number of pink rulers sold in Bookstore B = 475 (More) 
Number of pink rulers sold in Bookstore C = 225 

Colour(s) of rulers that Bookstore B sold less than Bookstore C = Yellow (Y)

(c)
Percentage decrease in the number of orange rulers sold by Bookstore C from May to June
= ²⁰₁₂₅ x 100%
= ⁴₂₅ x 100%
= 16%

Answer(s): (a) 475; (b) Y; (c) 16%