Question 1120446
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The other tutor didn't show a complete solution, so I don't know how much work remained to reach the answer from where they left off.  In any case, I get a different answer than they did....<br>
There are many different ways the problem can be set up; the method I used shown below may not be the easiest or most efficient....<br>
Let m be the mother's current age<br>
Then 100-m is Juanita's current age, since the sum of their ages is 100.<br>
Let s be the son's current age.<br>
The number of years until Juanita is her mother's current age is the difference of their current ages: m-(100-m) = 2m-100.<br>
According to the statement of the problem, m is Juanita's age "then".<br>
The son's age "then" is s + (2m-100).<br>
Juanita "then" will be 5 times as old as her son is now:
(1) m = 5s.<br>
Her son's age "then" will be 8 more than Juanita's current age:
(2) s+2m-100 = 108-m  -->  s+3m = 208.<br>
Substitute (1) in (2) to find s, the son's current age.<br>
s+3(5s) = 208
s+15s = 208
16s = 208
s = 13<br>
The son's current age is 13.
So the mother's current age is 5(13) = 65.
So Juanita's current age is 100-65 = 35.