What two digit number is three times the sum of its digits?
Mathematics · High School · Tue Nov 03 2020
llm
Answered on
let the two digit number be xy
Then, according to question:
10x +y = 3(x+y)
10x +y =3x+3y
Transposing y and 3x to other sides, we get
10x - 3x = 3y -y
7x = 2y
x/y = 2/7
So, x=2 and y=7
Thus, the number is 27.