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

1. Half of the files sold by Stationery Shop L were yellow files. How many yellow files did Stationery Shop L sell?
2. Which colour(s) of files did Stationery Shop L sell less than Stationery Shop M? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In August, Stationery Shop M sold 20 less green files than the number of green files sold in July. What was the percentage increase in the number of green files sold by Stationery Shop M from July to August?

(a)
Number of orange files sold in Stationery Shop L = 20
Number of green files sold in Stationery Shop L = 200
Number of blue files sold in Stationery Shop L = 140

Since yellow files sold in Stationery Shop L is half of the files sold by Stationery Shop L, the total of green files, blue files and orange files is equal to yellow files.

Number of yellow files sold in Stationery Shop L
= 200 + 140 + 20
= 360

(b)
Number of orange files sold in Stationery Shop L = 20 (Less) 
Number of orange files sold in Stationery Shop M = 160

Number of green files sold in Stationery Shop L = 200 (More)
Number of green files sold in Stationery Shop M = 40

Number of blue files sold in Stationery Shop L = 140 (Equal)
Number of blue files sold in Stationery Shop M = 140

Number of yellow files sold in Stationery Shop L = 360 (More) 
Number of yellow files sold in Stationery Shop M = 160 

Colour(s) of files that Stationery Shop L sold less than Stationery Shop M = Orange (O)

(c)
Percentage decrease in the number of green files sold by Stationery Shop M from July to August
= ²⁰₄₀ x 100%
= ¹₂ x 100%
= 50%

Answer(s): (a) 360; (b) O; (c) 50%