PSLE
Shops V and W sell post-it-pads of four colours. The bar graphs show the number of post-it-pads sold by each shop in October. The bar for the number blue post-it-pads sold by Shop V has not been drawn.

1. Half of the post-it-pads sold by Shop V were blue post-it-pads. How many blue post-it-pads did Shop V sell?
2. Which colour(s) of post-it-pads did Shop V sell less than Shop W? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In November, Shop W sold 10 less purple post-it-pads than the number of purple post-it-pads sold in October. What was the percentage increase in the number of purple post-it-pads sold by Shop W from October to November?

(a)
Number of green post-it-pads sold in Shop V = 125
Number of purple post-it-pads sold in Shop V = 200
Number of orange post-it-pads sold in Shop V = 200

Since blue post-it-pads sold in Shop V is half of the post-it-pads sold by Shop V, the total of purple post-it-pads, orange post-it-pads and green post-it-pads is equal to blue post-it-pads.

Number of blue post-it-pads sold in Shop V
= 200 + 200 + 125
= 525

(b)
Number of green post-it-pads sold in Shop V = 125 (Less) 
Number of green post-it-pads sold in Shop W = 150

Number of purple post-it-pads sold in Shop V = 200 (More)
Number of purple post-it-pads sold in Shop W = 125

Number of orange post-it-pads sold in Shop V = 200 (Equal)
Number of orange post-it-pads sold in Shop W = 200

Number of blue post-it-pads sold in Shop V = 525 (More) 
Number of blue post-it-pads sold in Shop W = 175 

Colour(s) of post-it-pads that Shop V sold less than Shop W = Green (G)

(c)
Percentage decrease in the number of purple post-it-pads sold by Shop W from October to November
= ¹⁰₁₂₅ x 100%
= ²₂₅ x 100%
= 8%

Answer(s): (a) 525; (b) G; (c) 8%