Marisa has taken 5 math tests and scored the following, 83,88,95,83,92. what does she need to score 6th math test in order to have a test average of 90 overall?

Question

so i have almost solved but i am stuck i add them all up so it looks like

83+88+92+95+x=90 all over

             6 

then i got 

441+x

    6       but idk what to do now because the correct answer is 99

 

Answer 1

The last expression you got is:

(441+x)/6 = 90

Solving for x:

441 + x = (90)(6) = 540

441 + x = 540

x = 540 - 441

x = 99

Answer 2

you have the equation (441+x)/6 = 90;

now multiply both sides by 6 (to 'clear fraction'), getting

441+ x = 540

therefore x = 99

Answer 3

So close!

 

(441 + x)/6 = 90

 

What do we do to counteract dividing by 6? Multiply by 6!

 

441 + x = 540

x = 99