Question

To pass a course with a grade A, a student must have an average of 90 or greater . A students grades on three tests are 85,94 and 84. Find what score the student must get on the next test to get an average A

Answer 1

Given:

A student's grades on three tests are 85,94 and 84.

The student must have an average of 90 or greater.

Let the score of the next test = x

So, the average will be:

`(x+85+94+84)/(4)\ge90`

Solve for x, Multiply both sides by 4

`\begin{gathered} x+85+94+84\ge90\cdot4 \\ x+263\ge360 \\ x\ge360-263 \\ x\ge97 \end{gathered}`

So, the answer will be:

The student must get 97 or greater to get an average A.