Question 1191574
b, amount of money at beginning


{{{b-20-25-(1/2)(b-20-25)-23.75=42.15}}}--------this is the description, literally as an equation.


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{{{b-20-25-(1/2)(b-20-25)-23.75=42.15}}}

{{{b-45-(1/2)(b-45)=42.15+23.75}}}

{{{b-(1/2)(b-45)=42.15+23.75+45}}}

{{{2b-(b-45)=2(42.15+23.75+45)}}}

{{{2b-b+45=2(42.15+23.75+45)}}}

{{{b=-45+2(42.15+23.75+45)}}}

{{{b=-45+221.8}}}

{{{highlight(b=176.8)}}}

You should check to see this works in the equation and fits the description.