SOLUTION: 7. Frank bought supplies for school. In the first store, he spent half of his money plus $10. In the second store, he spent half of what he had left, plus $10. In the third stor

Question 1090359: 7. Frank bought supplies for school. In the first store, he spent half of his money plus $10. In the second store, he spent half of what he had left, plus $10. In the third store, he spent 80% of what he had left. He came home with $5. How much did he start out with?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n be the amount Frank started with. Then, after each store, he would have:
1st store:n/2 -10
2nd store:1/2(n/2 -10) -10
3rd store:.2((1/2(n/2 -10) -10))
So: .2((1/2((n/2 -10) -10))=5
Then, solve for n
You can also work backwards. For example, Frank ends with $5. Since, in the third store, he spent 80% of what he had left after the second store, he would have 5/.2, or $25. Then, add $10 and multiply by 2 to get $70, etc..
☺☺☺☺
RELATED QUESTIONS
Frank bought supplies for school. In the first store, he spent half of his money plus... (answered by ankor@dixie-net.com)

Eloise bought new clothes for school. In the first store, she spent half the money she... (answered by scott8148)

Hope you can help me. Thx for ur time! :D Mr. Zerman went shopping. In the first store (answered by stanbon,MathTherapy)

Jacob made two trips to the store. On his first trip to the store, he bought x kitchen... (answered by Theo)

Auggie spent all of his money in 5 stores. In each store, he spent $1 more than one-half... (answered by solver91311)

Solomon went to the shopping centre to buy supplies for his mathematics project. He spent (answered by Fombitz,advanced_Learner)

Hi I missed this question at an employment exam. I would like to see how you would solve... (answered by stanbon,jojo14344,josmiceli,shannonb)

Thomas went to the store and spent half of his money and then $8 more. He went to a... (answered by josgarithmetic)

Thomas went to the store and spent half of his money and then $8 more. He went to a... (answered by LynnMomo,ikleyn,MathTherapy)