PSLE
Four girls, Kylie, Jane, Tiffany and Mary raised money for a charity. Kylie and Jane raised a total of $106. Together, Jane, Tiffany and Mary raised a total of $248. The total amount of money raised by all 4 girls is 5 times the amount that Jane raised. How much money did Tiffany and Mary raise?
Amount that Jane and Kylie raised = $106
Amount that Jane, Tiffany and Mary raised = $248

Jane is the repeated identity.

Jane + Kylie = 106 --- (1)
Jane + Tiffany + Mary = 248 --- (2)

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

(1) + (2)
(Jane + Kylie) + (Jane + Tiffany + Mary) = 106 + 248
Jane + 4 girls = 354
1 u + 5 u = 354
6 u = 354

1 u = 354 ÷ 6 = 59

Total amount that Tiffany and Mary raised
= 248 - 1 u
= 248 - 59
= $189

Answer(s): $189