PSLE
Four girls, Emily, Cindy, Roshel and Irene raised money for a charity. Emily and Cindy raised a total of $134. Together, Cindy, Roshel and Irene raised a total of $306. The total amount of money raised by all 4 girls is 4 times the amount that Cindy raised. How much money did Roshel and Irene raise?
Amount that Cindy and Emily raised = $134
Amount that Cindy, Roshel and Irene raised = $306

Cindy is the repeated identity.

Cindy + Emily = 134 --- (1)
Cindy + Roshel + Irene = 306 --- (2)

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

(1) + (2)
(Cindy + Emily) + (Cindy + Roshel + Irene) = 134 + 306
Cindy + 4 girls = 440
1 u + 4 u = 440
5 u = 440

1 u = 440 ÷ 5 = 88

Total amount that Roshel and Irene raised
= 306 - 1 u
= 306 - 88
= $218

Answer(s): $218