The mean of 3 numbers are 12. if one number is 5 and the other is 11, write an equation and solve it to find the third number.

Question

can you please help.This is solving an equation!

Answer 1

The mean of 3 numbers are 12. if one number is 5 and the other is 11, write an equation and solve it to find the third number.

 

The mean is just the average, which is the following equation..

 

((5+ 11 + X) / 3 ) = 12

 

Solving for X we get

 

(5+ 11 + X) = 12 * 3

 

X = (12 * 3 ) - 5 - 11

 

Solve the rest for X