SOLUTION: the average of 4 temp. readings is 8. 3 readings are -7, 24, -14. What's the 4th reading?

Algebra ->  Rectangles -> SOLUTION: the average of 4 temp. readings is 8. 3 readings are -7, 24, -14. What's the 4th reading?       Log On


   

Question 948918: the average of 4 temp. readings is 8. 3 readings are -7, 24, -14. What's the 4th reading?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
If the average of 4 readings is 8, the sum of the readings must be 4(8)=32
The sum of the first 3 readings: -7+24+(-14)=3
(Sum of the four)-(sum of three)= Last reading
32-3=29 ANSWER The fourth reading must be 29.