Question

Sam scored 43, 48, and 42 points on three tests. How many points should he get on the fourth test to get an average score of 50? (1 point) 83 points 67 points 45.75 points 44.33 points

Answer 1

So we know that an average is the sum of the scores divided by the number of scores that were added together. In this case we are going to be dealing with 4 tests. So let's say x is the score for our fourth test. We can create this equation:

$\frac{x+43+48+42}{4}=50$

So then we need to simplify the top:

$\frac{x+133}{4}=50$

Then multiply by 4 on both sides to get rid of the denominator:

$x+133=200$

Then solve for x:

$x=67$

So now we know that Sam needs to score a 67 on the fourth test to have an average score of 50.