Question 768660
A student has an average of 72% in 9 tests that she wrote.
 She still needs to write one more test and wants to achieve a total average of 75%.
 What percentage must she get for the last test?
:
Let x = the grade of the last test
:
The last test is only 10% of the total grade, therefore
{{{(9(72) + x)/10}}} = 75
648 + x = 750
x = 750 - 648
x = !02% so it may not be possible