SOLUTION: in a two digit number ,ten's digit is twice the unit's digit.the number formed by interchanging the digits is 36 less than the original number what's the original number

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Question 985179: in a two digit number ,ten's digit is twice the unit's digit.the number formed by interchanging the digits is 36 less than the original number what's the original number

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
10t+u, original number

system%28t=2u%2C10u%2Bt=-36%2B10t%2Bu%29

Simple substitution.

10u-u=-t%2B10t-36
9u=9t-36
9u=9%282u%29-36
9u-18u=-36
u=4
-
t=2u
t=8

Number was 84.