Question 218329
{{{s=(n/2)(a+t)}}} Start with the given equation.



{{{2s=n(a+t)}}} Multiply both sides by 2



{{{(2s)/(a+t)=n}}} Divide both sides by {{{a+t}}}



{{{n=(2s)/(a+t)}}} Rearrange the equation.



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Answer:



So {{{n=(2s)/(a+t)}}}