Answer:
95
Step-by-step explanation:
To find average, you add all of the numbers up and divide by the amount of numbers you have. In this case, you have 3 scores, and then you're looking at another score, so you have a total of 4 numbers. We can set up an equation using this:
[tex]\frac{93 + 87 + 85 + x}{4} =90[/tex]
When you simplify, you get:
[tex]\frac{265 + x}{4} = 90[/tex]
Simplify further by multiplying 4 on both sides:
[tex]265 + x = 360[/tex]
Solve for x:
[tex]x = 95[/tex]
