Well, isn't that just a happy little question! To find the number halfway between 20 and 80, we add them together to get 100, then we divide by 2 to find the middle point. So, the number halfway between 20 and 80 is 50. Just like painting, sometimes finding balance is the key to creating a beautiful picture.
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Oh, dude, halfway between 60 and 80 is like 70. You just add 60 and 80 together, which is 140, and divide by 2 to get 70. It's like the Goldilocks number, not too big, not too small, just right in the middle.
80 and 100
20 is 80% of 25
80% of 25=20 so answer is 25
No number between 55 and 101 is a multiple of 410, though some are multiples of 20. 60, 80 and 100 are the multiples of 20 in that range, but none of them are multiples of 410. So no number between 55 and 101 is a multiple of 410 and 20.