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

1. Half of the highlighters sold by Store K were orange highlighters. How many orange highlighters did Store K sell?
2. Which colour(s) of highlighters did Store K sell less than Store L? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In July, Store L sold 5 less yellow highlighters than the number of yellow highlighters sold in June. What was the percentage increase in the number of yellow highlighters sold by Store L from June to July?

(a)
Number of green highlighters sold in Store K = 125
Number of yellow highlighters sold in Store K = 175
Number of purple highlighters sold in Store K = 175

Since orange highlighters sold in Store K is half of the highlighters sold by Store K, the total of yellow highlighters, purple highlighters and green highlighters is equal to orange highlighters.

Number of orange highlighters sold in Store K
= 175 + 175 + 125
= 475

(b)
Number of green highlighters sold in Store K = 125 (Less) 
Number of green highlighters sold in Store L = 150

Number of yellow highlighters sold in Store K = 175 (More)
Number of yellow highlighters sold in Store L = 25

Number of purple highlighters sold in Store K = 175 (Equal)
Number of purple highlighters sold in Store L = 175

Number of orange highlighters sold in Store K = 475 (More) 
Number of orange highlighters sold in Store L = 200 

Colour(s) of highlighters that Store K sold less than Store L = Green (G)

(c)
Percentage decrease in the number of yellow highlighters sold by Store L from June to July
= ⁵₂₅ x 100%
= ¹₅ x 100%
= 20%

Answer(s): (a) 475; (b) G; (c) 20%