When the digit is under 5 you round down but when it is 5 or more you round up. 25 would round to 30.
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(20 + 30)/2 = 25
When rounding a number to the nearest ten, we look at the digit in the ones place. In this case, the ones digit in 25 is 5. Since 5 is greater than or equal to 5, we round up to the nearest ten, which is 30. Rounding to 20 would be incorrect in this case because 5 is closer to 30 than it is to 20.
30
25 is exactly between 20 and 30.
20 + 21 + 22 + 23 + 25 + 27 + 30 + 30 = 198/8 = 24.75