PSLE
Four girls, Tina, Linda, Marion and Xylia raised money for a charity. Tina and Linda raised a total of $194. Together, Linda, Marion and Xylia raised a total of $291. The total amount of money raised by all 4 girls is 4 times the amount that Linda raised. How much money did Marion and Xylia raise?
Amount that Linda and Tina raised = $194
Amount that Linda, Marion and Xylia raised = $291

Linda is the repeated identity.

Linda + Tina = 194 --- (1)
Linda + Marion + Xylia = 291 --- (2)

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

(1) + (2)
(Linda + Tina) + (Linda + Marion + Xylia) = 194 + 291
Linda + 4 girls = 485
1 u + 4 u = 485
5 u = 485

1 u = 485 ÷ 5 = 97

Total amount that Marion and Xylia raised
= 291 - 1 u
= 291 - 97
= $194

Answer(s): $194