PSLE
Four girls, Opal, Roshel, Gabby and Winnie raised money for a charity. Opal and Roshel raised a total of $167. Together, Roshel, Gabby and Winnie raised a total of $303. The total amount of money raised by all 4 girls is 4 times the amount that Roshel raised. How much money did Roshel raise?
Amount that Roshel and Opal raised = $167
Amount that Roshel, Gabby and Winnie raised = $303

Roshel is the repeated identity.

Roshel + Opal = 167 --- (1)
Roshel + Gabby + Winnie = 303 --- (2)

Amount that Roshel raised = 1 u
Amount that 4 girls raised = 4 u

(1) + (2)
(Roshel + Opal) + (Roshel + Gabby + Winnie) = 167 + 303
Roshel + 4 girls = 470
1 u + 4 u = 470
5 u = 470

1 u = 470 ÷ 5 = 94

Amount that Roshel raised
= 1 u
= $94

Answer(s): $94