PSLE
Shops K and L sell notebooks of four colours. The bar graphs show the number of notebooks sold by each shop in November. The bar for the number purple notebooks sold by Shop K has not been drawn.

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

(a)
Number of green notebooks sold in Shop K = 100
Number of pink notebooks sold in Shop K = 225
Number of blue notebooks sold in Shop K = 200

Since purple notebooks sold in Shop K is half of the notebooks sold by Shop K, the total of pink notebooks, blue notebooks and green notebooks is equal to purple notebooks.

Number of purple notebooks sold in Shop K
= 225 + 200 + 100
= 525

(b)
Number of green notebooks sold in Shop K = 100 (Less) 
Number of green notebooks sold in Shop L = 175

Number of pink notebooks sold in Shop K = 225 (More)
Number of pink notebooks sold in Shop L = 50

Number of blue notebooks sold in Shop K = 200 (Equal)
Number of blue notebooks sold in Shop L = 200

Number of purple notebooks sold in Shop K = 525 (More) 
Number of purple notebooks sold in Shop L = 175 

Colour(s) of notebooks that Shop K sold less than Shop L = Green (G)

(c)
Percentage decrease in the number of pink notebooks sold by Shop L from November to December
= ⁴⁵₅₀ x 100%
= ⁹₁₀ x 100%
= 90%

Answer(s): (a) 525; (b) G; (c) 90%