Question 666329: a two-digit number is such that the tens digit is at least 5 more than twice the units digit. find all positive integers.
Found 2 solutions by josmiceli, MathTherapy:
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! If the 10s digit is  , then
The units digit can be  ,  or 
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If the 10's digit is  , then
The units digit can be or
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If the 10's digit is  , then
The units digit can be or
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The 10's digit is  or lower
The units digit must be 
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the numbers are
10,20,30,40,50,60,
70,71,80,81,90,91, or 92
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Hope I got it
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
a two-digit number is such that the tens digit is at least 5 more than twice the units digit. find all positive integers.
Let the tens digit be T, and the units digit, U
Then: 
Let U = 0
 , or T = 5, 6, 7, 8, or 9
Numbers would then be 
Let U = 1
 , or T = 7, 8, or 9
Numbers would then be: 
Let U = 2
 , or T = 9
Number would then be: 
The number could be any of the above 9
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