Question

Gavins mean score on 3 math tests is 87. What equation can be solves to find x the score he needs on his test to bring his mean score up to 90

Answer 1

Explanation:

Answer 2

`90=(261+x)/(4)`

Explanation:

Let x be the score on 4th test.

We have been given that Gavin's mean score on 3 math tests is 87.

Since we know that average is the sum divided by the count.

`\text{Average}=\frac{\text{Total sum of all the numbers}}{\text{Number of items in the set}}`

Let us find sum of scores on 3 math tests by multiplying 87 by 3.

`\text{Scores on 3 tests}=3* 87`

`\text{Scores on 3 tests}=261`

Since Gavin needs the mean score on his 4 tests to be 90. This means score on 3 tests plus x divided by 4 will be equal to 90.

`90=(261+x)/(4)`

Therefore, the equation
`90=(261+x)/(4)` can be solved to find the score that Gavin needs on his test to bring his mean score up to 90.