You score an 86 on the first of two exams. Write and solve an equation to find the score x that you need on the second exam to have a mean score of 90.

Question

1. An equation is___=90
2. Needed score:

Answer 1

(86+86+x)/3 = 90

86 + 86 + x = 270

172 + x = 270

x = 270 - 172

= 98