Math, asked by nandasunandamp7e1fu, 1 year ago

is there someone ...needed some help.​

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Answers

Answered by tarunzxt29092003
3

Answer:

Step-by-step explanation:here's your answer

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Answered by TakenName
9

Answer:

18

Step-by-step explanation:

The sum of the digits of a two-digit number is 9.

Let the digit of 10 be a.

And let the digit of 1 be b.

a+b=9

b=9-a

Nine times this number is twice

the number obtained by reversing the order of the digits.

'This number' means 10a+b.

'The number obtained by reversing the order of the digits' is 10b+a.

Substitute b=9-a.

10a+b equals 9a+9.

10b+a equals -9a+90.

9(9a+9)=2(-9a+90)

81a+81=-18a+180

99a=99

a=1, thus b=8

∴ The number is 18.

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