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=(30+1 1/2)*1/3+(40+1 1/3)*1/4+(40+1 1/4)*1/5 =10+(3/2)*(1/3)+10*(4/3)(1/4)+10+(5/4)(1/4) =30+1/2+1/3+1/4 =30+13/12 =31 1/12
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