Question

Susan has an average of 86 in her three examinations. What grade must she receive on her next test if she wants to raise her average to 88?

Answer 1

Answer:

94

Step-by-step explanation:

Let the total score in three exams be x.

Average of three exams is 86.

This means

86=x/3

So, x=86*3

x=258.

Suppose in fourth exam her score is y.

Average of these four exams is 88.

This means

88=(x+y)/4

88=(258+y)/4

y=88*4-258

y=352-258

y=94

So, Susan needs to score 94 marks in fourth exam so that her average is 88