PSLE
Stationery Shops C and D sell punchers of four colours. The bar graphs show the number of punchers sold by each shop in September. The bar for the number blue punchers sold by Stationery Shop C has not been drawn.

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

(a)
Number of purple punchers sold in Stationery Shop C = 15
Number of green punchers sold in Stationery Shop C = 40
Number of pink punchers sold in Stationery Shop C = 25

Since blue punchers sold in Stationery Shop C is half of the punchers sold by Stationery Shop C, the total of green punchers, pink punchers and purple punchers is equal to blue punchers.

Number of blue punchers sold in Stationery Shop C
= 40 + 25 + 15
= 80

(b)
Number of purple punchers sold in Stationery Shop C = 15 (Less) 
Number of purple punchers sold in Stationery Shop D = 50

Number of green punchers sold in Stationery Shop C = 40 (More)
Number of green punchers sold in Stationery Shop D = 20

Number of pink punchers sold in Stationery Shop C = 25 (Equal)
Number of pink punchers sold in Stationery Shop D = 25

Number of blue punchers sold in Stationery Shop C = 80 (More) 
Number of blue punchers sold in Stationery Shop D = 50 

Colour(s) of punchers that Stationery Shop C sold less than Stationery Shop D = Purple (P)

(c)
Percentage decrease in the number of green punchers sold by Stationery Shop D from September to October
= ⁵₂₀ x 100%
= ¹₄ x 100%
= 25%

Answer(s): (a) 80; (b) P; (c) 25%