Sarah and Emma have $199. Min and Sarah have $235. The ratio of Emma to Min is 1 : 4. How much does Sarah have?
Amount that Emma has = 1 u
Amount that Min has = 4 u
The amount that Sarah has is the repeated identity.
Sarah + 1 u = 199 --- (1)
Sarah + 4 u = 235 --- (2)
(2) - (1)
4 u - 1 u = 235 - 199
3 u = 36
1 u = 36 ÷ 3 = 12
From (1):
Sarah + 1 u = 199
Sarah + 1 x 12 = 199
Sarah + 12 = 199
Amount that Sarah has
= 199 - 12
= $187
Answer(s): $187
