SOLUTION: Ross is six years older than twice his sister Holly's age. The difference in their ages is 18 years. How old is Holly?

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Question 451278: Ross is six years older than twice his sister Holly's age. The difference in their ages is 18 years. How old is Holly?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Ross is six years older than twice his sister Holly's age. The difference in their ages is 18 years. How old is Holly.
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let x = Ross' age=2y +6
let y = Holly's age
x-y=18
y=x-18
x=2y+6
x=2(x-18)+6
x=2x-36+6
-x=-30
x=30
y=x-18=0-18=12
ans:
Hollys age = 12 years
Ross' age =2y+6=24+6=30 years