Kimberly and Emily have $173. Mary and Kimberly have $237. The ratio of Emily to Mary is 3 : 7. How much does Kimberly have?
Amount that Emily has = 3 u
Amount that Mary has = 7 u
The amount that Kimberly has is the repeated identity.
Kimberly + 3 u = 173 --- (1)
Kimberly + 7 u = 237 --- (2)
(2) - (1)
7 u - 3 u = 237 - 173
4 u = 64
1 u = 64 ÷ 4 = 16
From (1):
Kimberly + 3 u = 173
Kimberly + 3 x 16 = 173
Kimberly + 48 = 173
Amount that Kimberly has
= 173 - 48
= $125
Answer(s): $125
