What number is that , to which, if it's half be added, and from the sum 20 be subtracted, the remainder will be a fourth of the number itself?
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let the number be x 7 is added to it => x+7 sum is multiplied by 5 => 5(x+7) ... What will be the remainder if the number is divided by 105? ... 27--> 7 was added=> Subtract 7 gives 20.
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