Sylvia checked the balance in her bank account early in the morning and saw that she had 98 dollars. In the afternoon, she noticed that there was an overdraft of 6 dollars in the account for unpaid bills. How much were the unpaid bills?
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The problem has 1 important component. It is the word "Overdraft."
Overdraft occurs when the bank gives you money to cover amount you did not have at the time the bills were paid. In this case, what you did not have is 6 dollars. Since the bank gave it to you, you owe it to the bank. Therefore, you owe 6 dollars to the bank and this can be expressed as -6.
The amount of unpaid bills is the difference between what you had that morning (98) and what you have this afternoon (-6).
98 - -6 = 98 + 6 = 104 dollars
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