A number consists of two digits whose sum is 8. If 18 is added to the number, it's digits are interchanged. The no. is? please answer with explanation
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let one no. = x
therefore otheer no.= 8-x
sum =x +80- 10x
=80 - 9x
a.t.q
80- 9x +18 = 10x +8 -x
=98 - 9x =9x +8
=98 - 8 =9x +9x
=90 = 18 x
x =90 / 18
x =5
therefore otheer no.= 8-x
sum =x +80- 10x
=80 - 9x
a.t.q
80- 9x +18 = 10x +8 -x
=98 - 9x =9x +8
=98 - 8 =9x +9x
=90 = 18 x
x =90 / 18
x =5
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