The number pattern below is based on a rule. Each number is somehow related to some numbers next to it. For instance, 25 and 9 could have used subtraction to come up with 16. The same simple rule is used for the entire pattern. Find the rule and solve for x.

  63   9  38  33  32  12  
88  25  16  18  15   x   5

Answer: 11
Solution: 88 63  8+8+6+3 = 25
              25 9    2+5+9 = 16
             16 38   1+6+3+8= 18
             18 33   1+8+3+3= 15
             15 32   1+5+3+2= 11 (This is x)
Proof:    11 12   1+1+1+2 = 5

This is not a complete solution, I still don't know where 63, 9, 38,... come from.
Someone else got to figure this out, I'm of to bed.

Posted by Hugo on 2004-12-16 22:44:02