PSLE
Book Shops L and M sell staplers of four colours. The bar graphs show the number of staplers sold by each shop in June. The bar for the number yellow staplers sold by Book Shop L has not been drawn.

1. Half of the staplers sold by Book Shop L were yellow staplers. How many yellow staplers did Book Shop L sell?
2. Which colour(s) of staplers did Book Shop L sell less than Book Shop M? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Book Shop M sold 5 less orange staplers than the number of orange staplers sold in June. What was the percentage increase in the number of orange staplers sold by Book Shop M from June to July?

(a)
Number of purple staplers sold in Book Shop L = 10
Number of orange staplers sold in Book Shop L = 40
Number of blue staplers sold in Book Shop L = 25

Since yellow staplers sold in Book Shop L is half of the staplers sold by Book Shop L, the total of orange staplers, blue staplers and purple staplers is equal to yellow staplers.

Number of yellow staplers sold in Book Shop L
= 40 + 25 + 10
= 75

(b)
Number of purple staplers sold in Book Shop L = 10 (Less) 
Number of purple staplers sold in Book Shop M = 30

Number of orange staplers sold in Book Shop L = 40 (More)
Number of orange staplers sold in Book Shop M = 20

Number of blue staplers sold in Book Shop L = 25 (Equal)
Number of blue staplers sold in Book Shop M = 25

Number of yellow staplers sold in Book Shop L = 75 (More) 
Number of yellow staplers sold in Book Shop M = 50 

Colour(s) of staplers that Book Shop L sold less than Book Shop M = Purple (P)

(c)
Percentage decrease in the number of orange staplers sold by Book Shop M from June to July
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 75; (b) P; (c) 25%