Q49 2011, Average

A student on her first 3 tests received an average score of N points. If she exceeds her previous average score by 20 points on her fourth test, then what is the average score for the first 4 tests?

अपने प्रथम तीन परीक्षणों में किसी छात्रा का औसत प्राप्तांक N अंक है। यदि वह अपने चौथे परीक्षण में पिछले औसत प्राप्तांक से 20 अंक अधिक प्राप्त करती है, तो प्रथम चार परीक्षणों का औसत प्राप्तांक क्या है ?

The average score of student in 3 tests is N points. Hence the total score = 3N points.

Given the score in fourth test = N + 20, the average score of student in four tests will be = (3N +N+20)/4 = N+5