The average weight of 3 men is 53 kg. None of them weights less than 51 kg. What is the maximum possible weight (in kg) of a person in that group?

$\begin{array}{l}\text { Solve: } 3 \text { men is } 53 \mathrm{~kg} . \\ \therefore 3 \times 53=159 \mathrm{~kg} . \\ \therefore 3 \times 51=153 \mathrm{~kg} \\ \therefore(159-153)=4 \mathrm{~kg} . \\ \therefore \text { so, maximum weight is }=53+4=57 \mathrm{~kg}\end{array}$