It is 27.5, the number halfway between the two middle numbers.
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90
It is: 35
10, 10, 20, 30, 30, 50.
30% of 40 is equal to 30 X 40 / 100 = 12 25% of 20 is equal to 25 X 20 / 100 = 5 answer together is 30X40+25X20 / 100 = 17
10-20 16 20-30 4 30-40 _ 40-50 _ 50-60 _ 60-70 2