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




Question Number 18465 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 ajfour last updated on 22/Jul/17
let smaller digit=x  larger =x+3  sum=2x+3=5  ⇒   x=1,    x+3=4.  Numbers are      14 and 41.
$$\mathrm{let}\:\mathrm{smaller}\:\mathrm{digit}=\mathrm{x} \\ $$$$\mathrm{larger}\:=\mathrm{x}+\mathrm{3} \\ $$$$\mathrm{sum}=\mathrm{2x}+\mathrm{3}=\mathrm{5} \\ $$$$\Rightarrow\:\:\:\mathrm{x}=\mathrm{1},\:\:\:\:\mathrm{x}+\mathrm{3}=\mathrm{4}. \\ $$$$\mathrm{Numbers}\:\mathrm{are}\:\:\:\:\:\:\mathrm{14}\:\mathrm{and}\:\mathrm{41}. \\ $$

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