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Re: If the digits of a two-digit number T are reversed and the number obta [#permalink]
1
T can be written as 10*t + u ,where t is the digit in tenth place and u is the digit in the unit place

so the question becomes
10t + u - (10u +t)
= 9t - 9u
=9(t-u)

hence the difference must be a multiple of 9. Only 64 is not a multiple of 9, so answer is E
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Re: If the digits of a two-digit number T are reversed and the number obta [#permalink]
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