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If seven less than half of the number is 35 then 7 plus 35 must be half of the number. 7 + 35 = 42 and if that is half the number the whole number must be 42 x 2, which is 84.
35 is not half of 17.5. It is twice 17.5, so 17.5 is half of 35.
Less than one half of a number is a quarter of a number.
-1495
1/2 = .5 so 35 and a half = 35.5