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Question Number 18466 by chernoaguero@gmail.com last updated on 22/Jul/17

The sum of the digits of a two digit  number is 5 and their difference is 3.  Find the number.

$$\mathrm{The}\:\mathrm{sum}\:\mathrm{of}\:\mathrm{the}\:\mathrm{digits}\:\mathrm{of}\:\mathrm{a}\:\mathrm{two}\:\mathrm{digit} \\ $$$$\mathrm{number}\:\mathrm{is}\:\mathrm{5}\:\mathrm{and}\:\mathrm{their}\:\mathrm{difference}\:\mathrm{is}\:\mathrm{3}. \\ $$$$\mathrm{Find}\:\mathrm{the}\:\mathrm{number}. \\ $$

Answered by Tinkutara last updated on 22/Jul/17

Let number = 10x + y  x + y = 5;  x − y = 3  ⇒ x = 4, y = 1  ∴ Number = 41 or 14

$$\mathrm{Let}\:\mathrm{number}\:=\:\mathrm{10}{x}\:+\:{y} \\ $$$${x}\:+\:{y}\:=\:\mathrm{5}; \\ $$$${x}\:−\:{y}\:=\:\mathrm{3} \\ $$$$\Rightarrow\:{x}\:=\:\mathrm{4},\:{y}\:=\:\mathrm{1} \\ $$$$\therefore\:\mathrm{Number}\:=\:\mathrm{41}\:\mathrm{or}\:\mathrm{14} \\ $$

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