Tom, Jim and Peter earned £$620$ together for painting a wall.  The ratio of Tom\textquotesingle s reward to Jim\textquotesingle s reward is $3:4$.  The ratio of Jim\textquotesingle s reward to Peter\textquotesingle s reward is $6:5$.  How much money did Tom earn? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Proportions->Dividing Quantities Based on Ratio
$3:4=9:12$, $6:5=12:10$, their rewards were in the ratio of $9:12:10$.  $620\div(9+12+10)=20$, $20\times9=180$. 