KY : Isaac => 25 : 75 , KY has $2100 left
KY : Isaax => 75 : 25 , KY has $900 left.
Both scenario, ISaac spent all his mnoney. Which also mean that’s the amount he has in the begining
We multiply 3 to scenario 2, so both scenario share common units. And that make sense coz in the end, Issac spent what he has in both scenario.
Scenario 2 now becomes,
KY : Isaac => 225 : 75, and KY has 900 left.
Now both scenario share common units, I can define KY money with two equation, one each from both scenario
KY = 25u + $2100
KY = 225u + $900
25u + 2100 = 225u + 900
200u = 1200
u = 6
KY was given = 25u + 2100 = $2250 ###
Isaac was given = 75u = $450 ###