Răspuns :
a + b + c = 60
fie a = 30
b= 30 : 6 = 5
_______________________
c = ?
( a + b ) + c = 60
( 30 + 5 ) + c = 60
35 + c = 60
c = 60 - 35
c = 25
fie a = 30
b= 30 : 6 = 5
_______________________
c = ?
( a + b ) + c = 60
( 30 + 5 ) + c = 60
35 + c = 60
c = 60 - 35
c = 25
a=30
6b=a, 6b = 30 ⇒ b=30:6= 5
a+b+c=60
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30+5+c=60
c=60-35 = 25
6b=a, 6b = 30 ⇒ b=30:6= 5
a+b+c=60
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30+5+c=60
c=60-35 = 25