PSLE
Stores E and F sell files of four colours. The bar graphs show the number of files sold by each shop in June. The bar for the number yellow files sold by Store E has not been drawn.

1. Half of the files sold by Store E were yellow files. How many yellow files did Store E sell?
2. Which colour(s) of files did Store E sell less than Store F? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Store F sold 30 less purple files than the number of purple files sold in June. What was the percentage increase in the number of purple files sold by Store F from June to July?

(a)
Number of orange files sold in Store E = 40
Number of purple files sold in Store E = 80
Number of blue files sold in Store E = 40

Since yellow files sold in Store E is half of the files sold by Store E, the total of purple files, blue files and orange files is equal to yellow files.

Number of yellow files sold in Store E
= 80 + 40 + 40
= 160

(b)
Number of orange files sold in Store E = 40 (Less) 
Number of orange files sold in Store F = 60

Number of purple files sold in Store E = 80 (More)
Number of purple files sold in Store F = 40

Number of blue files sold in Store E = 40 (Equal)
Number of blue files sold in Store F = 40

Number of yellow files sold in Store E = 160 (More) 
Number of yellow files sold in Store F = 50 

Colour(s) of files that Store E sold less than Store F = Orange (O)

(c)
Percentage decrease in the number of purple files sold by Store F from June to July
= ³⁰₄₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 160; (b) O; (c) 75%