Question

A two digit number is 4 times the sum of its digits .if 18 is added to the number , the digits are reversed .find the numbr

Answer 1

let the no. be 10x+y
4x+4y=10x+y
6x-3y=0
2x-y=0
y=2x
10x+y+18=10y+x
9x-9y=-18
x-y=-2
x-2x=-2
-x=-2
x=2

y=4

no.=24