Question

23. The sum of the digit of a two digit number is 9. Also,
nine times of this number is twice the number obtained
versin the order of the digit. Find the number. 3
by​

Answer 1

Answer:

Hence, the number is 10y + x = 10 ×1 + 8 = 18.

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

x+y=9,of two digit number

9(10x+y)=2(10y+x)

90x+9y=20y+2x

88x-11y=0

11(8x-y)=0

8x-y=0

solving both eq

x+y=9

8x-y=0

_______

9y=9

y=1

substitute y in eq 1

x+1=9

x=8

number is 10(8)+1=81