Please edit the question to include more context or relevant information. In particular, it would help if we know where these numbers appear in the pyramid.
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it has 80 that is the answer
If you mean: 5, 10, 20, 40 then the following number is twice the previous number which will be 80
From the pattern (n + 4, n + 2, n + ?) I would say the next following number is 20 (n + 1).
The number which best completes the sequence below is 20 5 30 6 42 7
three