SOLUTION: Hi i need exactly step by step solution in this word problem,and check it.thanks The sum of the digits of the two-digits number is 3.The tens digits is one more than the unit di

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: Hi i need exactly step by step solution in this word problem,and check it.thanks
The sum of the digits of the two-digits number is 3.The tens digits is one more than the unit digit.Find the numbers.
This question is from textbook

Found 2 solutions by edjones, josmiceli:
Answer by edjones(8007)   (Show Source): You can put this solution on YOUR website!
Let the units digit=u and the tens digit=t.
t+u=3
t-u=1
-----add
2t=4
.
t=2
u=1
.
21 is the number.
.
Ed

Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
Let = the tens digit
Let = the units digit
(1)
(2)
substitute the expression for in (2) for in (1)



and since



The number is 21
This checks with (1) and (2)

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