PSLE
Stationery Kiosks S and T sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in February. The bar for the number green rulers sold by Stationery Kiosk S has not been drawn.

1. Half of the rulers sold by Stationery Kiosk S were green rulers. How many green rulers did Stationery Kiosk S sell?
2. Which colour(s) of rulers did Stationery Kiosk S sell less than Stationery Kiosk T? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In March, Stationery Kiosk T sold 5 more orange rulers than the number of orange rulers sold in February. What was the percentage increase in the number of orange rulers sold by Stationery Kiosk T from February to March?

(a)
Number of orange rulers sold in Stationery Kiosk S = 45
Number of blue rulers sold in Stationery Kiosk S = 35
Number of pink rulers sold in Stationery Kiosk S = 5

Since green rulers sold in Stationery Kiosk S is half of the rulers sold by Stationery Kiosk S, the total of orange rulers, blue rulers and pink rulers is equal to green rulers.

Number of green rulers sold in Stationery Kiosk S
= 45 + 35 + 5
= 85

(b)
Number of orange rulers sold in Stationery Kiosk S = 45 (More)
Number of orange rulers sold in Stationery Kiosk T = 10

Number of blue rulers sold in Stationery Kiosk S = 35 (Equal)
Number of blue rulers sold in Stationery Kiosk T = 35

Number of pink rulers sold in Stationery Kiosk S = 5 (Less) 
Number of pink rulers sold in Stationery Kiosk T = 40

Number of green rulers sold in Stationery Kiosk S = 85 (More) 
Number of green rulers sold in Stationery Kiosk T = 15 

Colour(s) of rulers that Stationery Kiosk S sold less than Stationery Kiosk T = Pink (P)

(c)
Percentage increase in the number of orange rulers sold by Stationery Kiosk T from February to March
= ⁵₁₀ x 100%
= ¹₂ x 100%
= 50%

Answer(s): (a) 85; (b) P; (c) 50%