Question 1083254

let's say you originally have {{{x}}} dollars on your bank account 
 
if you withdrew {{{1/10}}} of your original amount, it is {{{(1/10)x}}}

if you have {{{80}}} dollars left, means

{{{x-(1/10)x=80}}}.....solve for {{{x}}}

{{{10x/10-x/10=80}}}

{{{9x/10=80}}}

{{{9x=80*10}}}

{{{9x=800}}}

{{{x=800/9}}}

{{{x=88.88888888888889}}}

round it {{{x=88.89}}}->original amount

check:

{{{x=88.89}}}->original amount

{{{(1/10)x=(1/10)88.89=8.89}}}-> amount you withdrew

{{{x-(1/10)x=80}}}

{{{88.89-8.89=80}}}

{{{80=80}}}