SOLUTION: Please solve. Alvin is 4 years older than Simon. Theodore is 5 times as old as Simon. The sum of all their ages is 64. How old is Simon?

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Question 732898: Please solve. Alvin is 4 years older than Simon. Theodore is 5 times as old as Simon. The sum of all their ages is 64. How old is Simon?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+a+=+s+%2B+4+
+t+=+5s+
+a+%2B+s+%2B+t+=+64+
-----------------
By substitution,
+s+%2B+4+%2B+s+%2B+5s+=+64+
+7s+=+60+
+s+=+8.57+
+t+=+5%2A8.57+
+t+=+42.85+
+a+=+s+%2B+4+
+a+=+8.57+%2B+4+
+a+=+12.57+
--------------
Simon is 8 yrs 6 mos 25 days approximately
check:
+a+%2B+s+%2B+t+=+64+
+12.57+%2B+8.57+%2B+42.85+=+64+
+63.99+=+64+
close enough