Question

A student in a linguistics class finishes the semester with a 70 average on five tests. If the student scored 84, 78, 58, and 61 on his first four tests, what was his score on the final test?

Answer 1

5 * 70 - 84 - 78 - 58 - 61

Answer 2

=69

Answer 3

\[\frac{84+78+58+61+x}{5}=70\rightarrow x=(70\times5)-84+78+58+61\]
The student scored a 69 on his last test.