PSLE
Stores L and M sell files of four colours. The bar graphs show the number of files sold by each shop in February. The bar for the number pink files sold by Store L has not been drawn.

1. Half of the files sold by Store L were pink files. How many pink files did Store L sell?
2. Which colour(s) of files did Store L sell less than Store M? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In March, Store M sold 10 less yellow files than the number of yellow files sold in February. What was the percentage increase in the number of yellow files sold by Store M from February to March?

(a)
Number of orange files sold in Store L = 50
Number of yellow files sold in Store L = 175
Number of green files sold in Store L = 100

Since pink files sold in Store L is half of the files sold by Store L, the total of yellow files, green files and orange files is equal to pink files.

Number of pink files sold in Store L
= 175 + 100 + 50
= 325

(b)
Number of orange files sold in Store L = 50 (Less) 
Number of orange files sold in Store M = 150

Number of yellow files sold in Store L = 175 (More)
Number of yellow files sold in Store M = 25

Number of green files sold in Store L = 100 (Equal)
Number of green files sold in Store M = 100

Number of pink files sold in Store L = 325 (More) 
Number of pink files sold in Store M = 100 

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

(c)
Percentage decrease in the number of yellow files sold by Store M from February to March
= ¹⁰₂₅ x 100%
= ²₅ x 100%
= 40%

Answer(s): (a) 325; (b) O; (c) 40%