Question 231746
The average of four numbers is 18.
 If one of the four numbers, 25, is taken away, what is the average of the remaining three numbers?
:
Let x = the average of the remaining 3 numbers
:
{{{(3x+25)/4}}} = 18
3x + 25 = 4(18)
3x = 72 - 25
3x = 47
x = {{{47/3}}}
x = 15{{{2/3}}} is the average of the remaining 3 numbers