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Determinati suma tuturor numerelor naturale care împartite la 6 dau catul 5

Răspuns :

a:6=5 rest 0
a=5×6+0
a=30+0
a=30

b:6=5 rest 1
b=5×6+1
b=30+1
b=31

c:6=5 rest 2
c=5×6+2
c=30+2
c=32

d:6=5 rest 3
d=5×6+3
d=30+3
d=33

e:6=5 rest 4
e=5×6+4
e=30+4
e=34

f:6=5 rest 5
f=5×6+5
f=30+5
f=35

30+31+32+33+34+35=
61+32+33+34+35=
93+33+34+35=
126+34+35=
160+35=195