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2014-06-17T21:58:14+03:00
x    ⇒19
x+1⇒19+1=20
x+2⇒19+2=21
x+3⇒19+3=22
x+4⇒19+4=23 (este numărul cautat )

x+(x+1)+(x+2)+(x+3)+(x+4)=105
5x+10=105
5x=105-10
5x=95
x=19


3 5 3
2014-06-17T23:35:17+03:00
A+b+c+d+e=105
n+n+1+n+2+n+3+n+4=105/-10
5n=95/:5
n=19
a=19
b=20
c=21
d=22
e=23