SOLUTION: Jill's present age is three times her sister's age two years ago. If Jill is 18 years old, how old is her sister now?

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Question 317180: Jill's present age is three times her sister's age two years ago. If Jill is 18 years old, how old is her sister now?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Jill's present age is three times her sister's age two years ago.
j = 3(s-2)
j = 3s - 6
:
If Jill is 18 years old, how old is her sister now?
Replace j in the above equation with 18
18 = 3s - 6
18 + 6 = 3s
24 = 3s
s = 24%2F3
s = 8 yrs sister now
:
:
Check solution in the statement
"Jill's present age is three times her sister's age two years ago. "
18 = 3(8-2)