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Currently, you have $80 answer your sister has $145. You decide to save $6 of your allowance each week, while your sister decides to spend her whole allowance plus $7 each week. How long will it be before you have as much money as your sister?

Sagot :

x is the number of weeks

your money = 80 + 6x, her money = 145 - 7x

her money = your money when 80 +6x = 145 - 7x
                                                    13x=65
                                                    x=5 weeks

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