SOLUTION: Sally is 1 uear older than 3 times the age of Joe.Chris is 5 years younger than 6 times the age of Joe.If sally and Chris are the same age how ol is Joe ?

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Question 1050212: Sally is 1 uear older than 3 times the age of Joe.Chris is 5 years younger than 6 times the age of Joe.If sally and Chris are the same age how ol is Joe ?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = Sally's age now
Let +b+ = Joe's age now
Let +c+ = Chris's age now
----------------------------
(1) +a+=+3b+%2B+1+
(2) +c+=+6b+-+5+
(3) +a+=+c+
----------------------
Substitute (3) into (2)
(2) +a+=+6b+-+5+
(2) +-a+%2B+6b+=+5+
and
(1) +a+-+3b+=+1+
---------------------
Add (1) and (2)
(1) +a+-+3b+=+1+
(2) +-a+%2B+6b+=+5+
---------------------
+3b+=+6+
+b+=+2+
and
(1) +a+=+3b+%2B+1+
(1) +a+=+3%2A2+%2B+1+
(1) +a+=+7+
---------------------
(3) +a+=+c+
(3) +7+=+c+
---------------------
Sally is 7
Joe is 2
Chris is 7