16. Angela earns a weekly allowance at the start of each week. She started the week with just her weekly allowance. Then, she spent half of her weekly allowance at the movies. To earn more money, her parents let her clean the windows in the house for $5. What is her weekly allowance if she ended the week with $8? Solve using arithmetic or algebra, and explain your step
Let's say Angela's weekly allowance is x dollars.
She spent half of her weekly allowance at the movies, which is (1/2)x dollars.
After spending that money, she earned another 5 dollars by cleaning the windows.
Therefore, she had x - (1/2)x + 5 dollars at the end of the week.
Combining like terms, we get (1/2)x + 5 = 8.
Subtracting 5 from both sides, we have (1/2)x = 3.
Multiplying both sides by 2, we get x = 6.
Therefore, Angela's weekly allowance is 6 dollars.