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HI, thank you for the explanation. One quick question, but what if the unit is 0? Then you wouldn't be able to find it out.
Thank you
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GabrielaFGalera
HI, thank you for the explanation. One quick question, but what if the unit is 0? Then you wouldn't be able to find it out.
Thank you

The units digit of x cannot be 0 because this violates both statements.

    (1) says: The units digit of 2*x is less than the units digit of x.

Now, if the units digit of x were 0, then the units digit of 2*x would also be 0. So, in this case the units digit of 2*x would NOT be less than the units digit of x.

    (2) says: The tens digit of 2*x is 7.

If the units digit of x were 0, then the last two digits of 2*x would be 2*...30 = ...60. So, in this case the tens digit of 2*x would NOT be 7.

Hope it's clear.
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