Eddie and Avril competed in a road safety quiz. They agreed on the following rules: 10 points will be rewarded to the person with the correct answer; 5 points will be deducted otherwise (wrong answer or skipping the question). They each answered $10$ questions and got $155$ points altogether. If Eddie got $15$ more points than Avril, how many questions did Avril answer correctly? 
Overseas Competition->Knowledge Point->Word Problem Modules->Chicken-Rabbit Problems->Solving Chicken-Rabbit Problems by Using Hypothesis