Question

Daca a+b=20,3si b+c=23,14 atunci a+2b+c=...

Answer 1

$a+2b+c= a+b+b+c \\\\ a+b=20,3 \\ b+c=23,14 \\\\\\ a+2b+c=20,3+23,14 \to \boxed{43,44}$

Answer 2

daca suntem atenti observam ca:
a+b  +   b+c  =a+2b+c  = 20.3+23.14=43.44