PSLE
A fruit stall sold plums at 70¢ and oranges at 40¢ each. Roshel bought some plums and Opal bought some oranges from the stall. Opal spent $0.90 less than Roshel, but had 6 fruits more than Roshel.

1. How many oranges did Opal buy?
2. How much did Roshel spend on the plums?

	Plums	Oranges
Number	1 u	1 u + 6
Value	0.7	0.4
Total value	0.7 u	0.4 u + 2.4

(a)
Number of plums that Roshel bought = 1 u
Number of oranges that Opal bought = 1 u + 6

Amount that Roshel paid = 0.7 x 1 u = 0.7 u
Amount that Opal paid = 0.4(1 u + 6) = 0.4 u + 2.4

If Opal spent another $0.90, both Opal and Roshel would spend the same amount.

0.7 u = 0.4 u + 2.4 + 0.9
0.7 u - 0.4 u = 2.4 + 0.9
0.3 u = 3.3

1 u = 3.3 ÷ 0.3 = 11

Number of oranges that Opal bought
= 1 u + 6
= 11 + 6
= 17

(b)
Amount that Roshel spent on the plums
= 0.7 u 
= 0.7 x 11 
= $7.70

Answer(s): (a) 11; (b) $7.70