A balance stands at -45 units, and a deposit of 60 units is paid in. What is the new balance?

Բացատրություն

The opening forty-five units of the deposit clear the debt exactly, and the fifteen units left over stay in the balance, which therefore ends above zero. Keeping the minus sign treats the deposit as though it deepened the debt, and adding the sizes describes two debts rather than a debt and a payment.