PSLE
Four girls, Elyse, Joelle, Marion and Hazel raised money for a charity. Elyse and Joelle raised a total of $87. Together, Joelle, Marion and Hazel raised a total of $351. The total amount of money raised by all 4 girls is 5 times the amount that Joelle raised. How much money did Joelle raise?
Amount that Joelle and Elyse raised = $87
Amount that Joelle, Marion and Hazel raised = $351

Joelle is the repeated identity.

Joelle + Elyse = 87 --- (1)
Joelle + Marion + Hazel = 351 --- (2)

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

(1) + (2)
(Joelle + Elyse) + (Joelle + Marion + Hazel) = 87 + 351
Joelle + 4 girls = 438
1 u + 5 u = 438
6 u = 438

1 u = 438 ÷ 6 = 73

Amount that Joelle raised
= 1 u
= $73

Answer(s): $73