Natalia wants to share some chocolates with her friends. If she gives each friend $18$ pieces of chocolate, then there will be $41$ chocolates in excess. If she gives each friend $23$ pieces of chocolate, she will be short of $34$ pieces. If she gives each friend $20$ pieces of chocolate, how many pieces of chocolate will she be left with? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems of Difference and Multiple