Question

Gianna is taking a multiple choice test with a total of 100 points available. Each question is worth exactly 5 points. What would be Gianna's test score (out of 100) if she got 3 questions wrong? What would be her score if she got xx questions wrong?

Answer 1

Her test score would be an 85 because 5x3=15 and then you would subtract 15 from 100 which would be 85

equation would be x=100-(5y)

Answer 2

`85`

Explanation:

Let
`x` equal the number of questions.

Let's find how many total questions there are:

`100=5x`

Divide by the coefficient of
`x`, which in this case is
`5.`

`20=x`

So we have a total of
`20` questions, each are worth
`5` points.

Now, Gianna got
`3` questions wrong, and if we know there are
`20` total questions...

`20-3`

Solve.

`20-3=17`

So we know Gianna got
`17` questions correct.

Let's use an expression to figure out her score.

Again, let
`x` equal the number of questions.

`5x`

Substitute.

`5(17)`

Multiply.

`85`