Observe the pattern and answer the following questions.
8 + 9 + 10 + 11 + 12 = 50 = 10×5
9 + 10 + 11 + 12 + 13 = 55 = 11×5
16 + 17 + 18 + 19 + 20 = 90 = 18×5
42 + 43 + 44 + 45 + 46 = 220 = 44×5
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