SOLUTION: Average of 4 numbers is 60. Three numbers are 65,50 and 70. Find the fourth number.

Algebra ->  Average -> SOLUTION: Average of 4 numbers is 60. Three numbers are 65,50 and 70. Find the fourth number.      Log On


   

Question 585095: Average of 4 numbers is 60. Three numbers are 65,50 and 70. Find the fourth number.
Found 2 solutions by richwmiller, josmiceli:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(65+50+70+x)/4=60
x=55
another way
60-5+10-10=55

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+%28+65+%2B+50+%2B+70+%2B+x+%29+%2F+4+=+60+
Multiply both sides by +4+
++65+%2B+50+%2B+70+%2B+x++=+240+
+185+%2B+x+=+240+
+x+=+55+
check answer:
+%28+65+%2B+50+%2B+70+%2B+55+%29+%2F+4+=+60+
+240%2F4+=+60+
+240+=+240+
OK