Erika and Jane have $233. Irene and Erika have $250. The ratio of Jane to Irene is 1 : 2. How much does Erika have?
Amount that Jane has = 1 u
Amount that Irene has = 2 u
The amount that Erika has is the repeated identity.
Erika + 1 u = 233 --- (1)
Erika + 2 u = 250 --- (2)
(2) - (1)
2 u - 1 u = 250 - 233
1 u = 17
From (1):
Erika + 1 u = 233
Erika + 1 x 17 = 233
Erika + 17 = 233
Amount that Erika has
= 233 - 17
= $216
Answer(s): $216
