<PRE><B>Question 1039742</B>
 The marks of 7 students in a test are 88, 75, 93, 98, 27, 80, and 36.
 If 8 students sat the test and the average mark was 65, what score did the eighth student achieve on the test?
:
let x = the score of the 8th student
:
{{{(88+75+93+98+27+80+36+x)/8}}} = 65
add em up and multiply both sides by 8
497 + x = 520
x = 520 - 497
x = 23 is the score of the 8th student</PRE>