PSLE
Book Shops X and Y sell punchers of four colours. The bar graphs show the number of punchers sold by each shop in April. The bar for the number blue punchers sold by Book Shop X has not been drawn.

1. Half of the punchers sold by Book Shop X were blue punchers. How many blue punchers did Book Shop X sell?
2. Which colour(s) of punchers did Book Shop X sell less than Book Shop Y? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In May, Book Shop Y sold 5 less pink punchers than the number of pink punchers sold in April. What was the percentage increase in the number of pink punchers sold by Book Shop Y from April to May?

(a)
Number of orange punchers sold in Book Shop X = 30
Number of pink punchers sold in Book Shop X = 60
Number of yellow punchers sold in Book Shop X = 90

Since blue punchers sold in Book Shop X is half of the punchers sold by Book Shop X, the total of pink punchers, yellow punchers and orange punchers is equal to blue punchers.

Number of blue punchers sold in Book Shop X
= 60 + 90 + 30
= 180

(b)
Number of orange punchers sold in Book Shop X = 30 (Less) 
Number of orange punchers sold in Book Shop Y = 90

Number of pink punchers sold in Book Shop X = 60 (More)
Number of pink punchers sold in Book Shop Y = 20

Number of yellow punchers sold in Book Shop X = 90 (Equal)
Number of yellow punchers sold in Book Shop Y = 90

Number of blue punchers sold in Book Shop X = 180 (More) 
Number of blue punchers sold in Book Shop Y = 50 

Colour(s) of punchers that Book Shop X sold less than Book Shop Y = Orange (O)

(c)
Percentage decrease in the number of pink punchers sold by Book Shop Y from April to May
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 180; (b) O; (c) 25%