The answer can be shown by adding the two middle numbers (30 and 40), and dividing by 2. The answer is 35. :)
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It is: 35
10-20 16 20-30 4 30-40 _ 40-50 _ 50-60 _ 60-70 2
10, 10, 20, 30, 30, 50.
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260