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

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

(a)
Number of pink files sold in Store J = 40
Number of green files sold in Store J = 200
Number of purple files sold in Store J = 200

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

Number of blue files sold in Store J
= 200 + 200 + 40
= 440

(b)
Number of pink files sold in Store J = 40 (Less) 
Number of pink files sold in Store K = 200

Number of green files sold in Store J = 200 (More)
Number of green files sold in Store K = 60

Number of purple files sold in Store J = 200 (Equal)
Number of purple files sold in Store K = 200

Number of blue files sold in Store J = 440 (More) 
Number of blue files sold in Store K = 180 

Colour(s) of files that Store J sold less than Store K = Pink (P)

(c)
Percentage decrease in the number of green files sold by Store K from June to July
= ³⁰₆₀ x 100%
= ¹₂ x 100%
= 50%

Answer(s): (a) 440; (b) P; (c) 50%