Question 22106
Let t = tens digit
u = units digit


The two equations:
t=3u, (which by the way implies that t is larger than u!)
t-u= 6


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Substitute t=3u into the second equation:
t-u= 6
(____)-u = 6
3u - u = 6
2u = 6
u= 3


t=3u
t=3*3= 9


The number is 93!


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