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?

Answer 1

Answer:

$t=\frac{u}{2}$ would complete the system

Number is 36

Step-by-step explanation:

Let t = the tens digit, u = the units digit

We have the sum of the two digits of a number is 9

          t + u = 9

We also have the tens digit is one-half the units digit

       $t=\frac{u}{2}$

Substituting

            $\frac{u}{2}+u=9\\\\\frac{3u}{2}=9\\\\u=6$

               t + 6 = 9

               t = 3

So the number is 36.

Answer 2

Answer: correct answer is t=1/2u

Step-by-step explanation: