Question 1005761
To attain a 95 average of four tests, she would need to total
4 * 95 = 380 points total.
So far she has earned 92+98+100 = 290 points
Thus she needs 380-290  at least 90 points...
We could also write
(290 + x)/4 >= 95
which leads to the same
x >= 90
conclusion...