98 is the answer the sum of the 2 digits is written as x+y=17,where x is the tens digit and y is the ones digit 4 times the tens wc is 4x is equal to thrice the ones +12 so 4x -3y=12 eliminate so (x + y= 17)3 4x-3y=12
add the equation you get 7x=63 x=9 x+y =17 9+y=17 y=8 the number is 98