Look at the series of numbers mentioned in the riddle and find the connection between the numbers.
What comes next in the sequence:
3, 9, 5, 12, 7, 15, 9, 18, ?, ?
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The listed numbers actually contains 2 alternate series;
3, 5, 7, 9 &
9, 12, 15, 15
So in the first sequence the numbers are increased by 2 & in the second sequence the number are increased by 3.
So the next 2 numbers will be as;
9 + 2 = 11 &
18 + 3 = 21.
Answer = 11, 21.
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11,21