Joelle and Fanny have $250. Tiffany and Joelle have $286. The ratio of Fanny to Tiffany is 1 : 3. How much does Joelle have?
Amount that Fanny has = 1 u
Amount that Tiffany has = 3 u
The amount that Joelle has is the repeated identity.
Joelle + 1 u = 250 --- (1)
Joelle + 3 u = 286 --- (2)
(2) - (1)
3 u - 1 u = 286 - 250
2 u = 36
1 u = 36 ÷ 2 = 18
From (1):
Joelle + 1 u = 250
Joelle + 1 x 18 = 250
Joelle + 18 = 250
Amount that Joelle has
= 250 - 18
= $232
Answer(s): $232
