Question 1147372
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            At the end of his post,  @josgarithmetic assumes about his solution/answer  "Possible mistake,  or Peter is aged  0."


            I confirm:   Yes, it is a mistake.    There is no doubt - as usual.   Just N3 wrong solution for today.


            So,  I came to provide a correct solution and correct answer.



<pre>
J-za, 2p

Peter, p

Alice, a


The description:

{{{system(p=a+5,2p+5=3(a+5))}}}


From the first equation, express  a = p-5  and substitute it into the second equation.  You will get


2p+5 = 3(p-5+5)

2p + 5 = 3p

5 = 3p - 2p

5 = p


<U>ANSWER</U>.  Peter is 5 years old.
</pre>

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After my notice, @josgarithmetic successfully re-wrote my answer.