SOLUTION: Elena has $240 in the bank. She withdraws %15 each week to pay for piano lessons. How many lessons can she afford with her savings? Write an equation.

Algebra ->  Equations -> SOLUTION: Elena has $240 in the bank. She withdraws %15 each week to pay for piano lessons. How many lessons can she afford with her savings? Write an equation.      Log On


   

Question 403988: Elena has $240 in the bank. She withdraws %15 each week to pay for piano lessons. How many lessons can she afford with her savings? Write an equation.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let n = lesson number starting with n=1 on 1st week
240+-+.15%2A240%2An = how much she has left after n weeks
Make this equal to zero which means she has used up all of savings
240+-+.15%2A240%2An+=+0
36n+=+240
n+=+6.667
She can afford 6 lessons