Question

Nigel wants to average 85% on his four tests. He got 77%, 89%, 78% on his first three tests. What does he need to get on his last test to average 85%?

Answer 1

Explanation:

Let x be the value of the test score needed to get 85

Equation

(77 + 89 + 78 + x)/4 = 85 Combine the left side to like terms

(244 + x)/4 = 85 Multiply by 4

244 + x = 85 * 4

244 + x = 340 Subtract 244

x = 340 - 244

x = 96

He needs to get 96 to average out to 85