PSLE
Four girls, Hazel, Risa, Roshel and Jean raised money for a charity. Hazel and Risa raised a total of $145. Together, Risa, Roshel and Jean raised a total of $329. The total amount of money raised by all 4 girls is 5 times the amount that Risa raised. How much money did Roshel and Jean raise?
Amount that Risa and Hazel raised = $145
Amount that Risa, Roshel and Jean raised = $329

Risa is the repeated identity.

Risa + Hazel = 145 --- (1)
Risa + Roshel + Jean = 329 --- (2)

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

(1) + (2)
(Risa + Hazel) + (Risa + Roshel + Jean) = 145 + 329
Risa + 4 girls = 474
1 u + 5 u = 474
6 u = 474

1 u = 474 ÷ 6 = 79

Total amount that Roshel and Jean raised
= 329 - 1 u
= 329 - 79
= $250

Answer(s): $250