Semaine Européenne 
Concours de mathématiques
Semaine Européenne
Concours de mathématiques
The answer from Montargis
x.... age of Jean12+y=(x+12)/3
2+y=(2+y)/13
12+y=(x+12)/3
12+y=x/3+4
2+y=2/3+x/13
1) y=x/3+4-12
y=x/3-8
2) 2+x/3-8=2/13+x/13
x/3-x/13=6+2/13
(13x-3x)/39=(78+2)/13
10x/39=80/13
x=(80/13)*(39/10)=24
x=24
1) y=(24/3)-8=0
Answer: His wife is pregnant now.
