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In how many weeks will Emily have enough money to buy a new bike?

Emily is saving money to buy a new bike that costs $189. She has saved $99 so far. She plans on saving $10 each week
 

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Kenneth S. | Algebra/Trig/Precalculus/Calculus Instructor Can Be Your TutorAlgebra/Trig/Precalculus/Calculus Instru...
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How much more does she need ($)?   
 
Divide above by $10/wk and you will get # of weeks.  Try to learn why this works, and try to become self-sufficient.