3 15 4 7 38 5 3 ? 5

3    15   4

7    38   5

3     ?    5

18 is the right answer

18 is the right answer

$15 = 3 \times 4 + 3$

$38 = 7 \times 5 + 3$

$18 = 3 \times 5 + 3$

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