Problema Solution
the sum of the digits of a two digit number is 12. If 15 is added to the number, the result is 6 times the units digit. find the number.
Answer provided by our tutors
Let
t = the tens digit
u = the units digit
This means the number is 10t + u
t + u = 12
(10t + u) + 15 = 6u
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t = 3
u = 9
The number is 3*10 + 9 = 39.