Laci is studying for her fourth algebra test. Her first three test scores were 82, 93, and 87. Laci needs to know what she must score on her test in order to have an average of exactly 90. Which equation can be used to find the score Laci needs?

a. x+82+93+87/4 = 90
b. 4(x+82+93+87) = 90
c. x/4+82+93+87 = 90
d. x+82+93+87 = 90/4

Question

Laci is studying for her fourth algebra test. Her first three test scores were 82, 93, and 87. Laci needs to know what she must score on her test in order to have an average of exactly 90. Which equation can be used to find the score Laci needs?

a. x+82+93+87/4 = 90
b. 4(x+82+93+87) = 90
c. x/4+82+93+87 = 90
d. x+82+93+87 = 90/4

anonymous · Answer

The answer is A. In order to solve for an average you must add all of the parts together then divide by the amount of scores.

candyme · Answer

A. x+82+93+87/4=90. This shows her three scores plus her unfinished test score averaged out.