Kenny, Timmy and Ron used some straws to make a structure each. Timmy used $$12$$ fewer straws than Kenny.~~Ron used $$20$$ more straws than Kenny. The three children used $$284$$ straws altogether. How many straws did Ron use? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems Involving Sum and Difference