Question

In order to get a A in his math class, a student needs to get an average of a 95 on four tests. He scored a 94, 89, and a 98 on his first three tests. What score does he need on his fourth test to earn the A? Define the variable, write and solve an equation, and answer the question.

Answer 1

99

Explanation:

let x be the score in his fourth test.

average is calculated as

average =
`(sum)/(count)` , thus

`(94+89+98+x)/(4)` = 95 ( multiply both sides by 4 )

281 + x = 380 ( subtract 281 from both sides )

x = 99

He needs a score of 99 on his fourth test.