Question

the sum of a 2 digit no. and the no. obtained by reversing its digits is 121 . find the no. if its units place is 5

Answer 1

Answer:

65

Step-by-step explanation:

Let our number is xy.

so always remember two digit number is written as xy = 10x+y

and it's reverse yx= 10y+x

Now sum = 121

so

10x+y+10y+x= 121

11x+11y = 121

11(x+y)= 121

x+y = 121/11

x+y = 11

Now unit digit which is y is given as 5

Hence,

x + 5 = 11

x = 11-5

x = 6

Hence we get our number as xy = 65

Thank you.