Opal and Kathy have $304. Sabrina and Opal have $324. The ratio of Kathy to Sabrina is 1 : 2. How much does Opal have?
Amount that Kathy has = 1 u
Amount that Sabrina has = 2 u
The amount that Opal has is the repeated identity.
Opal + 1 u = 304 --- (1)
Opal + 2 u = 324 --- (2)
(2) - (1)
2 u - 1 u = 324 - 304
1 u = 20
From (1):
Opal + 1 u = 304
Opal + 1 x 20 = 304
Opal + 20 = 304
Amount that Opal has
= 304 - 20
= $284
Answer(s): $284
