SOLUTION: Isaac is nine years older than Kylie. Isaac is four times as old as Brian was three years ago. Brian is eighteen years younger than Isaac. How old is Kylie?
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Question 193820: Isaac is nine years older than Kylie. Isaac is four times as old as Brian was three years ago. Brian is eighteen years younger than Isaac. How old is Kylie? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = Isaac's age now
Let = Kylie's age now
Let = Brian's age now
given:
(1) = Brian's age 3 years ago
(2)
(3)
-------------------
I have 3 equations and 3 unknowns,
so it is solvable
Substitute (2) in (3)
(3)
(3)
(3)
(3)
And from (2):
(2)
(2)
(2)
And from (1):
(1)
(1)
Kylie is 19
check answer:
Is Isaac nine years older than Kylie? Yes
Is Brian eighteen years younger than Isaac? Yes
Is Isaac four times as old as Brian was three years ago? Yes
