Question

The sum of the two digits of a number is 9. If the tens digit is one-half the units digit, what is the number?

Let t = the tens digit, u = the units digit, and t + u = 9. Which of the following equations would complete the system?

Answer 1

answers
t=1/2u
u=1/2t
t-u=1/2

Answer 2

\(\bf \text{If the }\color{blue}{\text{tens digit is one-half the units digit,}}\\
\text{ what is the number?} \)

Answer 3

the number is "tu"
where "t" is half of "u"

Answer 4

the no. is 36