Question

Wendy has taken two tests with scores of 77 and 80. To get an 82

average, what must her grade be on the third test?
Please help

Answer 1

89

Explanation:

Given that Wendy took 2 tests and scored, 77 and 80 respectively, let x represent the grade of Wendy's third test.

To get an average grade of 82, let's generate an equation to find x (Wendy's grade on her third test).

Average grade = sum of all 3 grades all over 3

`82 = (77 + 80 + x)/(3)`

`82 = (157 + x)/(3)`

Multiply 3 by both sides

`82*3 = (157 + x)/(3)*3`

`246 = 157 + x`

Subtract 157 from each side of the equation

`246 - 157 = 157 + x - 157`

`89 = x`

Wendy must score 89 on her third test to have an average of 82.