PSLE
Book Shops F and G sell folders of four colours. The bar graphs show the number of folders sold by each shop in June. The bar for the number pink folders sold by Book Shop F has not been drawn.

1. Half of the folders sold by Book Shop F were pink folders. How many pink folders did Book Shop F sell?
2. Which colour(s) of folders did Book Shop F sell less than Book Shop G? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Book Shop G sold 45 less purple folders than the number of purple folders sold in June. What was the percentage increase in the number of purple folders sold by Book Shop G from June to July?

(a)
Number of green folders sold in Book Shop F = 40
Number of purple folders sold in Book Shop F = 120
Number of orange folders sold in Book Shop F = 100

Since pink folders sold in Book Shop F is half of the folders sold by Book Shop F, the total of purple folders, orange folders and green folders is equal to pink folders.

Number of pink folders sold in Book Shop F
= 120 + 100 + 40
= 260

(b)
Number of green folders sold in Book Shop F = 40 (Less) 
Number of green folders sold in Book Shop G = 160

Number of purple folders sold in Book Shop F = 120 (More)
Number of purple folders sold in Book Shop G = 60

Number of orange folders sold in Book Shop F = 100 (Equal)
Number of orange folders sold in Book Shop G = 100

Number of pink folders sold in Book Shop F = 260 (More) 
Number of pink folders sold in Book Shop G = 100 

Colour(s) of folders that Book Shop F sold less than Book Shop G = Green (G)

(c)
Percentage decrease in the number of purple folders sold by Book Shop G from June to July
= ⁴⁵₆₀ x 100%
= ³₄ x 100%
= 75%

Answer(s): (a) 260; (b) G; (c) 75%