其它
Six friends went to hike together and agreed to share the bill equally. However, James forgot to bring his wallet, so each of his five friends paid an extra of $10.2$ dollars to cover James\textquotesingle~portion. How much did they have to pay in total? 
Overseas Competition->Knowledge Point->Word Problem Modules->Average Problems 
Everyone should pay $10.2\times5=51$ dollars. $51\times 6=306$ 