PSLE
Four girls, Esther, Kathy, Nicole and Winnie raised money for a charity. Esther and Kathy raised a total of $153. Together, Kathy, Nicole and Winnie raised a total of $192. The total amount of money raised by all 4 girls is 4 times the amount that Kathy raised. How much money did Nicole and Winnie raise?
Amount that Kathy and Esther raised = $153
Amount that Kathy, Nicole and Winnie raised = $192

Kathy is the repeated identity.

Kathy + Esther = 153 --- (1)
Kathy + Nicole + Winnie = 192 --- (2)

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

(1) + (2)
(Kathy + Esther) + (Kathy + Nicole + Winnie) = 153 + 192
Kathy + 4 girls = 345
1 u + 4 u = 345
5 u = 345

1 u = 345 ÷ 5 = 69

Total amount that Nicole and Winnie raised
= 192 - 1 u
= 192 - 69
= $123

Answer(s): $123