PSLE
Four girls, Tammy, Yoko, Gwen and Raeann raised money for a charity. Tammy and Yoko raised a total of $66. Together, Yoko, Gwen and Raeann raised a total of $126. The total amount of money raised by all 4 girls is 5 times the amount that Yoko raised. How much money did Yoko raise?
Amount that Yoko and Tammy raised = $66
Amount that Yoko, Gwen and Raeann raised = $126

Yoko is the repeated identity.

Yoko + Tammy = 66 --- (1)
Yoko + Gwen + Raeann = 126 --- (2)

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

(1) + (2)
(Yoko + Tammy) + (Yoko + Gwen + Raeann) = 66 + 126
Yoko + 4 girls = 192
1 u + 5 u = 192
6 u = 192

1 u = 192 ÷ 6 = 32

Amount that Yoko raised
= 1 u
= $32

Answer(s): $32