PSLE
Four girls, Nora, Raeann, Tammy and Lucy raised money for a charity. Nora and Raeann raised a total of $121. Together, Raeann, Tammy and Lucy raised a total of $431. 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 Nora raised = $121
Amount that Raeann, Tammy and Lucy raised = $431

Raeann is the repeated identity.

Raeann + Nora = 121 --- (1)
Raeann + Tammy + Lucy = 431 --- (2)

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

(1) + (2)
(Raeann + Nora) + (Raeann + Tammy + Lucy) = 121 + 431
Raeann + 4 girls = 552
1 u + 5 u = 552
6 u = 552

1 u = 552 ÷ 6 = 92

Amount that Raeann raised
= 1 u
= $92

Answer(s): $92