Question 665037
 Kyle Thompson has an average of 92 for the last three math quizzes. What must he make on the fourth quiz to raise his average to 94?
:
The trick here is to understand what is going on, he had a 92 av on the last 3
 tests therefore, their total has to be: 3*92 = 276
:
Let x = the required grade on the 4th test
:
{{{(x+276)/4}}} = 94
mult both sides by 4
x + 276 = 4(94)
subtract 276 from both sides
x = 376 - 276
x = 100 on the 4th test
:
Did this make sense to you now? C