Question

23. Eduardo wants to get a grade of 95 in his math

class. His grade will be the average of three test
scores. He got a 91 on the first test and a 89 on
the second test. Write an equation to represent
the situation. What score will he need on the
third test?

Answer 1

equation: (91 + 89 + x):3 = 95

score needed: x = 105

Explanation:

x - the third test score

average of three it's a sum of the three divided by 3:

(91 + 89 + x):3 = 95

×3 ×3

180 + x = 285

-180 - 180

x = 105