Question

Find a two digit number which is three times the sum of its digits.

Answer 1

let the two digit number be xy

10x +y = 3(x+y)
10x +y =3x+3y
7x = 2y

so simply we ca give x=2 and y=7

so number is 27

check.:
3(2+7) =3x9 =27

so correct

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