Question

The sum of the digits of a 2 digit number is 15. The number obtained by interchanging the digits exceeds the given no. By 9. Find the number graphically

Answer 1

Answer:-

Let the number be xy.

Given,the sum of the digits of a two digit number is 15.

x+y = 15 ...(1)

Also, if the digits are interchanged the result exceeds the original number by 9. 

10y+x=10x+y+9

10y+x-10x-y=9

9y-9x=9

y-x=1 ...(2)

(1)+(2) => 2y = 16

y = 16/2 = 8

(1) => x+8=15

x=15-8=7

Therefore the given number is 78 

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Answer 2

Refers to attachment ☻✔