PSLE
Four girls, Min, Fiona, Xylia and Gabby raised money for a charity. Min and Fiona raised a total of $132. Together, Fiona, Xylia and Gabby raised a total of $240. The total amount of money raised by all 4 girls is 5 times the amount that Fiona raised. How much money did Xylia and Gabby raise?
Amount that Fiona and Min raised = $132
Amount that Fiona, Xylia and Gabby raised = $240

Fiona is the repeated identity.

Fiona + Min = 132 --- (1)
Fiona + Xylia + Gabby = 240 --- (2)

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

(1) + (2)
(Fiona + Min) + (Fiona + Xylia + Gabby) = 132 + 240
Fiona + 4 girls = 372
1 u + 5 u = 372
6 u = 372

1 u = 372 ÷ 6 = 62

Total amount that Xylia and Gabby raised
= 240 - 1 u
= 240 - 62
= $178

Answer(s): $178