SOLUTION: jamie is 5 years older than her sister amy. If the sum of their ages is 19, how old is jamie?

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Question 189858: jamie is 5 years older than her sister amy. If the sum of their ages is 19, how old is jamie?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let j and a be the ages of jamie and amy
:
j+a=19........eq 1
j=a+5.........eq 2
:
take j's value from eq 2 and plug it into eq 1
::
a+5+a=19
:
2a=14
:
a=7
:
j=a+5=7+5=12