PSLE
Four girls, Penelope, Lynn, Yoko and Fiona raised money for a charity. Penelope and Lynn raised a total of $88. Together, Lynn, Yoko and Fiona raised a total of $254. The total amount of money raised by all 4 girls is 5 times the amount that Lynn raised. How much money did Yoko and Fiona raise?
Amount that Lynn and Penelope raised = $88
Amount that Lynn, Yoko and Fiona raised = $254

Lynn is the repeated identity.

Lynn + Penelope = 88 --- (1)
Lynn + Yoko + Fiona = 254 --- (2)

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

(1) + (2)
(Lynn + Penelope) + (Lynn + Yoko + Fiona) = 88 + 254
Lynn + 4 girls = 342
1 u + 5 u = 342
6 u = 342

1 u = 342 ÷ 6 = 57

Total amount that Yoko and Fiona raised
= 254 - 1 u
= 254 - 57
= $197

Answer(s): $197