Răspuns:
Explicație pas cu pas:
a = Andreea
b = Maria
c = Nicoleta
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a + b + c = 22 alune
c = a + 6
b = c - 2 = (a+6) - 2 = a+4
a + a+4 + a+6 = 22 =>
3·a + 10 = 22 =>
3·a = 12 => a = 12:3 => a = 4 alune
b = 4+4 => b = 8 alune
c = 4+6 => c = 10 alune
4+8+10 = 22
Andreea are 4 alune
Maria are 8 alune
Nicoleta are 10 alune