Question 1195913
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        You may consider what follows as a  " solution "  or as a joke (or both) - - - on your choice.


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I separate the given sequence in triples

(1)   8, 12, 18

(2)  18, 24, 38

(3)  38, 60, 98

(4)  98, 150, x


I use first three triples as a learning base to develop a pattern; 
then I use this pattern to predict x in the last triple.


1st triple: round 12 to the closest multiple of 10. It will be 10.

            Next,  8 + 10 = 18.


2nd triple: round 24 to the closest multiple of 10: it will be 20.

            Next, 18 + 20 = 38.


3rd triple: round 60 to the closest multiple of 10: it will be 60.

            Next, 38 + 60 = 98.


So, my pattern is just developed. Now I apply it to the last triple.

            I round 150 to the closest multiple of 10: it is 150.

            Finally, to predict x, I add 98 and 150:  x = 98 + 150 = 248.    <U>ANSWER</U>
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Solved &nbsp;&nbsp;//  &nbsp;&nbsp;or, &nbsp;in more accurate terms, &nbsp;one of million possible patterns is found.