Question

"X, seu total, e sua sétima parte, resulta 19." qual o valor de X?

Answer 1

Resolução:

$\mathsf{x+\dfrac{x}{7}=19}\\\\\\\mathsf{\dfrac{7\cdot x}{7}+\dfrac{x}{7}=19}\\\\\\\mathsf{\dfrac{7x+x}{7}=19}\\\\\\\mathsf{\dfrac{8x}{7}=19}\\\\\\\mathsf{8x=7\cdot 19}\\\\\\\mathsf{8x=133}\\\\\\\boxed{\mathsf{x=\dfrac{133}{8}\:ou\:16,62}}\: \: \checkmark$