Question

Carlito scored a 92 on his first math test, a 94 on the second, and an 88 on the third. If each test is worth points and there are four tests per year, what will Carlito need to score on the last test to have an average of 90 for the year?

Answer 1

Let x be his score on the last test so that to get an average of 90
His to average score at  year end (4 terms), including the last is:
(92 +94 + 98 + x)/4 =90
(92 +94 + 98 + x) =4 x 90
x = - 274 + 360
x= 86