The number is 425
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The square root of 400 is 20, and the square root of 450 is approximately 21.21. Therefore, the square number between 400 and 450 is 441, which is the square of 21.
The halfway point between 400 and 500 can be calculated by finding the average of the two numbers. Adding 400 and 500 gives us 900, and dividing that by 2 gives us 450. Therefore, the halfway point between 400 and 500 is 450.
It is (350 + 450)/2 = 400
450+400+300+350+250=1,750. Obviously.
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