Răspuns :
a+a+1+a+2+a+3+a+4 =380
5a+10=380
5a=370
a=74
Nr sunt : 74,75,76,77,78
5a+10=380
5a=370
a=74
Nr sunt : 74,75,76,77,78
a+a+1+a+2+a+3+a+4=380
5a+10=380
5a=380-10
5a=370
a=74
a+1=74+1=75
a+2=74+2=76
a+3=74+3=77
a+4=74+4=78
5a+10=380
5a=380-10
5a=370
a=74
a+1=74+1=75
a+2=74+2=76
a+3=74+3=77
a+4=74+4=78