SOLUTION: The tens digit of a certain two digit number is 1 more than 3 times the units digit. The original number is 9 less than 3 times the number formed by interchanging the digits. Find
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Question 550867: The tens digit of a certain two digit number is 1 more than 3 times the units digit. The original number is 9 less than 3 times the number formed by interchanging the digits. Find the original number. Please help me answer this! Found 2 solutions by lwsshak3, josmiceli:Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! The tens digit of a certain two digit number is 1 more than 3 times the units digit. The original number is 9 less than 3 times the number formed by interchanging the digits. Find the original number.
**
let u=unit's digit
let t=ten's digit=3u+1
..
original number: 10t+u=10(3u+1)=30u+10
interchanged number: 10u+t=10u+3u+1=13u+1
..
30u+10=3(13u+1)-9=39u+3-9=39u-6
9u=16
u=2
t=3u+1=7
original number=72
You can put this solution on YOUR website! Let = tens digit
Let = units digit
given:
(1)
(2)
---------------------------
(2)
(2)
Substitute (1) into (2)
(2)
(2)
(2)
(2)
Either I made a mistake, or this is
impossible to solve. Did you copy it right?
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