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?

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
RELATED QUESTIONS
Isaac is nine years older than Kylie. Isaac is four times as old as Brian was three years (answered by nerdybill)

4)Isaac is nine years older than Ruth.Isaac is four times as old as Brian was three years (answered by Edwin McCravy)

Janet is now three times older than brian. four years ago Janet was four times as old as... (answered by FrankM)

Ben is four times as old as Isaac. Six years ago, when was six times as old as Isaac.... (answered by stanbon,josgarithmetic)

5 years ago, Brian was twice as old as John.If Brian is 7 Years older than John, how old... (answered by ankor@dixie-net.com)

Isaac is 7 years older than Kylie. In 3 years the sum of their ages will be 63. How old... (answered by josgarithmetic)

The sum of the ages of Isaac and Autumn is 113 years. 9 years ago Isaac was 4 times... (answered by josgarithmetic)

Kylie is ten years older than Jefferson. Four years ago, Kylie was twice as old as... (answered by greenestamps,josgarithmetic)

Jack is nine years older than Tina. Jack is four times as old as Ali was three year ago. (answered by josmiceli,KMST)