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a+b=72 b>a de 5 ori a=? b=? repede dau coroana

Răspuns :

b = 5×a
a+b=a+5×a=6×a
6×a=72
a = 72 : 6
a = 12
b = 12 × 5 = 60
a+b=72
b=5a
a+5a=72⇒6a=72⇒a=72/6⇒a=12
12+b=72⇒b=72-12=60