To solve this series, let's analyze the pattern:
The series starts with the number 40, which is repeated twice. Then, the number 47 is repeated twice, followed by the number 54.
If we observe closely, we can see that the pattern is alternating between adding 7 and repeating the number twice.
So, the next number in the series should be obtained by adding 7 to the previous number, which is 54.
Therefore, the next number should be 54 + 7 = 61.
Hence, the correct answer is option D) 61.