Question

the sum of digits of a two digit number is 15 if the number formed by reversing the digits is less than 19 by the original number then find the number

Answer 1

let the required no. be x
A/Q
19 - x = 15
-x = 15 - 19
-x = -4
x = 4

Answer 2

let the no. be (10x+ y)
then
x+y= 15
according to the question

10x + y + 19 = 10y + x
=> 9x - 9y =-19
you will get (x-y)
we have (x+y) given
by solving both the equation you will get the value of x and y

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