Question 1006020
The average of 9 numbers is 43.
 When one of the numbers is subtracted.
 The new mean is 47. What is the number? 
:
Find total of the 9 original numbers; 9 * 43 = 387
:
{{{(387-n)/8}}} = 47
multiply both sides by 8
387 - n = 8(47)
-n = 376 - 387
-n = -11
n = 11 is the subtracted number