SOLUTION: The average of a,b,c and d is 25.Average of a,b and c is 22.What is the value of d or what number is 'd'?

Algebra ->  Average -> SOLUTION: The average of a,b,c and d is 25.Average of a,b and c is 22.What is the value of d or what number is 'd'?      Log On


   

Question 928851: The average of a,b,c and d is 25.Average of a,b and c is 22.What is the value of d or what number is 'd'?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Write down what you know.
%28A%2BB%2BC%2BD%29%2F4=25
A%2BB%2BC%2BD=100
.
.
.
%28A%2BB%2BC%29%2F3=22
A%2BB%2BC=66
.
.
.
Now substitute,
66%2BD=100
Now solve for D.