PSLE
Four girls, Nicole, Tiffany, Emily and Lucy raised money for a charity. Nicole and Tiffany raised a total of $126. Together, Tiffany, Emily and Lucy raised a total of $319. The total amount of money raised by all 4 girls is 4 times the amount that Tiffany raised. How much money did Nicole raise?
Amount that Tiffany and Nicole raised = $126
Amount that Tiffany, Emily and Lucy raised = $319

Tiffany is the repeated identity.

Tiffany + Nicole = 126 --- (1)
Tiffany + Emily + Lucy = 319 --- (2)

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

(1) + (2)
(Tiffany + Nicole) + (Tiffany + Emily + Lucy) = 126 + 319
Tiffany + 4 girls = 445
1 u + 4 u = 445
5 u = 445

1 u = 445 ÷ 5 = 89

Amount that Nicole raised
= 126 - 1 u
= 126 - 89
= $37

Answer(s): $37