Răspuns :
a+i =85
i =a+25
a + a+25 =85
2a =85-25
2a =60
a =30
i =a+25
i =30+25 =55
verif ; 30+55 =85
i =a+25
a + a+25 =85
2a =85-25
2a =60
a =30
i =a+25
i =30+25 =55
verif ; 30+55 =85