Question

a+b=15

b+c=13

a+c=14

a) 3a+3b+3c=

b) 5a+5b+5c=

c)a,b,c

Answer 1

2 (a+b+c)=42 
a+b+c = 21
a) 21x3 = 63
b) 21x5=105
c) a+b+c=42
15+c= 42
c=27
b= (daca ai invatat nr rationale negative) -14
a=-13