SOLUTION: I need a two digit number which after reversing I should get a two digit number which will be twice the previous number. Which is the number?

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Question 1040376: I need a two digit number which after reversing I should get a two digit number which will be twice the previous number.
Which is the number?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39625)   (Show Source): You can put this solution on YOUR website!


Simplify and make a two-dimensional cartesian graph. This will be a line and you can identify any points with only positive integer coordinates between 0 and 9.
Answer by MathTherapy(10555)   (Show Source): You can put this solution on YOUR website!

I need a two digit number which after reversing I should get a two digit number which will be twice the previous number.
Which is the number?
Let tens and units digits be T, and U, respectively

Then number is: 10T + U, and when reversed is: 10U + T

We then get: 10U + T = 2(10T + U)

10U + T = 20T + 2U 

20T - T = 10U - 2U

19T = 8U

T, or tens digit = 

There's no digit, from 1 - 9, that when multiplied by 8, results in a double-digit number that is a MULTIPLE of 19.

Therefore, there is:  

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