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(20 + 30)/2 = 25
30
25 is exactly between 20 and 30.
20 + 21 + 22 + 23 + 25 + 27 + 30 + 30 = 198/8 = 24.75
(30 + 20 - 25)/(5 * 5)Firstly, simplify the numerator:30 + 20 - 25 = 30 - 5 = 25Then simplify the bottom (although you could do the opposite as well):5 * 5 = 25Now, placing it back into the numerator and denominator, we have:25/25 = 1Also, you could simplify all of them at once, giving: 30/25 + 20/25 - 25/25 = 6/5 + 4/5 - 1 = 10/5 - 1 = 2 - 1 = 1.