Question 151970
Let "x"= original money he got
So, if he lost 30%: --------> [x-30%x=$3500], working eqn
Continuing,
{{{x(1-0.30)=3500}}} -----> {{{x(0.70)=3500}}}
{{{x*cross(0.70)/cross(0.70)=cross(3500)5000/cross(0.70)}}}
{{{x=5000}}} ----------> original money he has
In checking, we'll go back, losing 30%:
$5000-30%($5000)
$5000(1-0.30)
$5000(0.70)
$3500
Thank you
Jojo