Yoko and Erika have $250. Pamela and Yoko have $280. The ratio of Erika to Pamela is 1 : 4. How much does Yoko have?
Amount that Erika has = 1 u
Amount that Pamela has = 4 u
The amount that Yoko has is the repeated identity.
Yoko + 1 u = 250 --- (1)
Yoko + 4 u = 280 --- (2)
(2) - (1)
4 u - 1 u = 280 - 250
3 u = 30
1 u = 30 ÷ 3 = 10
From (1):
Yoko + 1 u = 250
Yoko + 1 x 10 = 250
Yoko + 10 = 250
Amount that Yoko has
= 250 - 10
= $240
Answer(s): $240
