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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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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 ??
I'm not understanding
you dont understand the part that the two digit number = 10b + a ??

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Other answers:

I don't understand how we start at 10b+a and then we go to a+b=12
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)
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is this correct?
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
therefore my answer is 39
yes it is.. good job :)
thank you!!!
glad to help :)

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