PSLE
A fruit stall sold guavas at 60¢ and plums at 30¢ each. Gillian bought some guavas and Risa bought some plums from the stall. Risa spent $1.20 less than Gillian, but had 3 fruits more than Gillian.

1. How many plums did Risa buy?
2. How much did Gillian spend on the guavas?

	Guavas	Plums
Number	1 u	1 u + 3
Value	0.6	0.3
Total value	0.6 u	0.3 u + 0.9

(a)
Number of guavas that Gillian bought = 1 u
Number of plums that Risa bought = 1 u + 3

Amount that Gillian paid = 0.6 x 1 u = 0.6 u
Amount that Risa paid = 0.3(1 u + 3) = 0.3 u + 0.9

If Risa spent another $1.20, both Risa and Gillian would spend the same amount.

0.6 u = 0.3 u + 0.9 + 1.2
0.6 u - 0.3 u = 0.9 + 1.2
0.3 u = 2.1

1 u = 2.1 ÷ 0.3 = 7

Number of plums that Risa bought
= 1 u + 3
= 7 + 3
= 10

(b)
Amount that Gillian spent on the guavas
= 0.6 u 
= 0.6 x 7 
= $4.20

Answer(s): (a) 7; (b) $4.20