Question

the ten digit of a certain two digit number exceeds the unit digit by 4. and 1 less than twice the unit digit. find the digit number

Answer 1

Let the tens digit = x
unit digit = y
number. T O
. ,. x y

Case I
x = y+4

Case II
x = 2y-1

Solving both equations we get

x = 9 and y = 5

Therefore the number is 95