Question

me ajudem.......
Não consegui fazer...

Answer 1

$\mathsf{10~\underline{~~a~~}~\underline{~~b~~}~\underline{~~c~~}~130}$

De acordo com o enunciado, devemos ter

$\mathsf{\bullet~~10+a+b=100}\\\\ \mathsf{a+b=100-10}\\\\ \mathsf{a+b=90}~~~~\mathbf{(i)}\\\\\\ \mathsf{\bullet~~a+b+c=200}\\\\ \mathsf{(a+b)+c=200}\\\\ \mathsf{90+c=200}\\\\ \mathsf{c=200-90}\\\\ \mathsf{c=110}~~~~\mathbf{(ii)}\\\\\\ \mathsf{\bullet~~b+c+130=300}\\\\ \mathsf{b+110+130=300}\\\\ \mathsf{b+240=300}\\\\ \mathsf{b=300-240}\\\\ \boxed{\begin{array}{c}\mathsf{b=60} \end{array}}$


Resposta: alternativa $\mathsf{b)~60.}$