Petunia wants to get a test average of 78 in math she got a 70 on her first test what grade will she need on the second test

Question

Petunia wants to get a test average of 78 in math she got a 70 on the first test what grade will she need on the second test

Answer 1

In my opinion, Petunia is setting her goal too low.

 

(x+70)/2 = 78, though, describes the situation, where x is the needed score on next test.  Can you find x now?