Question

Suma a yrei nr este 92.stiind ca a+b=55 si b+c=43,sa se afle nr..

Answer 1

c=92-55=37
a=92-43=49
b= 49+37=86=92-86=6

Answer 2

$\displaystyle \it a+b+c=92 \\ a+b=55 \\ b+c=43 \\ a+b+c=92 \Rightarrow 55+c=92 \Rightarrow c=92-55 \Rightarrow c=37 \\ b+c=43 \Rightarrow b+37=43 \Rightarrow b=43-37 \Rightarrow b=6 \\ a+b=55 \Rightarrow a+6=55 \Rightarrow a=55-6 \Rightarrow a=49 \\ a=49,~b=6,~c=37 \\ V:a+b+c=92 \Rightarrow 49+6+37=92$