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

1. Half of the files sold by Store D were purple files. How many purple files did Store D sell?
2. Which colour(s) of files did Store D sell less than Store E? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In December, Store E sold 15 less orange files than the number of orange files sold in November. What was the percentage increase in the number of orange files sold by Store E from November to December?

(a)
Number of blue files sold in Store D = 50
Number of orange files sold in Store D = 80
Number of green files sold in Store D = 90

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

Number of purple files sold in Store D
= 80 + 90 + 50
= 220

(b)
Number of blue files sold in Store D = 50 (Less) 
Number of blue files sold in Store E = 70

Number of orange files sold in Store D = 80 (More)
Number of orange files sold in Store E = 20

Number of green files sold in Store D = 90 (Equal)
Number of green files sold in Store E = 90

Number of purple files sold in Store D = 220 (More) 
Number of purple files sold in Store E = 70 

Colour(s) of files that Store D sold less than Store E = Blue (B)

(c)
Percentage decrease in the number of orange files sold by Store E from November to December
= ¹⁵₂₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 220; (b) B; (c) 75%