p=280,n=4,h=0.725,S=300,R=5/3, a/b=1, a+b=S, (a+c)/(b+d)=h, a+b+c+d+s=n*p, s=0.02(b+d), T=a+b+c+d+s, d=e+f, f=R(b+e) - Wolfram|Alpha

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