anonymous
  • anonymous
The sum of the digits of a two-digit number is 12. If the units digit is 3 times the tens digit, find the number.
Mathematics
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anonymous
  • anonymous
The sum of the digits of a two-digit number is 12. If the units digit is 3 times the tens digit, find the number.
Mathematics
chestercat
  • chestercat
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hoblos
  • hoblos
let a be the units digit and b be the tens digit the number = 10b +a to find a and b we must solve the system a+b =12 a= 3b can you solve it ??
anonymous
  • anonymous
I'm not understanding
hoblos
  • hoblos
you dont understand the part that the two digit number = 10b + a ??

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anonymous
  • anonymous
I don't understand how we start at 10b+a and then we go to a+b=12
hoblos
  • hoblos
no! these two parts are not related directly.. 10a+b is the general form of any two digits number but a+b =12 is concluded from the given ( The sum of the digits of a two-digit number is 12)
anonymous
  • anonymous
|dw:1344293939890:dw|
anonymous
  • anonymous
is this correct?
hoblos
  • hoblos
b=3 is correct but then you must replace (b=3) in the equation a+b=12 to get a and then add 10b +a
anonymous
  • anonymous
therefore my answer is 39
hoblos
  • hoblos
yes it is.. good job :)
anonymous
  • anonymous
thank you!!!
hoblos
  • hoblos
glad to help :)

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