PSLE
Four teams of students sold lemonade for charity.
They collected $7 for a small cup of lemonade and $9 for a big cup of lemonade.

The table shows the number of cups sold by three of the teams.

	Small cups	Big cups
Team P	19	2
Team Q	14	8
Team R	7	13

1. Which of the three teams collected the least money? Give your answer in letter. (Eg A)
2. What was the amount of money collected by Team R?
3. Team Q sold as many cups of lemonade as Team S but collected $8 less. How many small cups of lemonade did Team S sell?

(a)
Amount collected by Team P = 133 + 18
= $151

Amount collected by Team Q
= 14 x 7 + 8 x 9
= 98 + 72
= $170

Amount collected by Team R
= 7 x 7 + 13 x 9
= 49 + 117
= $166

Team P collected the least money.

(b)
Amount collected by Team R = $166

(c)

	Small cups	Big cups	Total cups	Total amount
Team Q	14	8	22	$170
Team S	10	12	22	170 + 8 = $178

Since Team Q and Team S sold the same number of cups but Team Q collected $8 less, it means that Team S sold more big cups than Team Q.

Difference in the total amount collected between Team Q and Team S = $8

Difference in the amount collected for every one extra big cup sold by Team S
= 9 - 7
= $2

Number of extra big cups sold by Team S
= 8 ÷ 2
= 4

Number of small cups sold by Team S
= 14 - 4
= 10

Answer(s): (a) P; (b) $166; (c) 10