Question

oq voce precisa esta na foto se for possivel explique em portugues faça passo a passo

Answer 1

This is a riddle where the left-hand side represents the amount spent and the right-hand side represents the balance.

We have that:

$\text{Total Spent+Current Balance=50}$

Adding the values in the balance column is not really necessary; in fact, it is coincidental in this case that the balances add up to 51.