PSLE
Four girls, Xuan, Raeann, Jaslyn and Usha raised money for a charity. Xuan and Raeann raised a total of $139. Together, Raeann, Jaslyn and Usha raised a total of $311. The total amount of money raised by all 4 girls is 5 times the amount that Raeann raised. How much money did Raeann raise?
Amount that Raeann and Xuan raised = $139
Amount that Raeann, Jaslyn and Usha raised = $311

Raeann is the repeated identity.

Raeann + Xuan = 139 --- (1)
Raeann + Jaslyn + Usha = 311 --- (2)

Amount that Raeann raised = 1 u
Amount that 4 girls raised = 5 u

(1) + (2)
(Raeann + Xuan) + (Raeann + Jaslyn + Usha) = 139 + 311
Raeann + 4 girls = 450
1 u + 5 u = 450
6 u = 450

1 u = 450 ÷ 6 = 75

Amount that Raeann raised
= 1 u
= $75

Answer(s): $75