Question

The sum of the digits of a two digit number is 15. The number obtained by interchanging the digits exceeds the given number by 9. Find the number graphically

Answer 1

Answer:

Step-by-step explanation:

let the number be 10x+y

with digits x,y

therefore x+y=15........(i)

again,

        10y+x-10x-y=9

or,    9y-9x=9

or,    x-y=-1..........(ii)

solving equation (i) and (ii) we get 

2x=14

x=7

and

y=8

therefore the number is 10x+y=10x7+8=78

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