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?

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

Answer 1

36 is the answer...hope it helps!

Answer 2

Requested number is 36

Explanation:

The first equation is as given t + u = 9

The second equation is t = (1/2)u => u = 2t

When we replace this in first equation we get:

t + 2t = 9 => 3t = 9 => t = 9/3 = 3

When we replace again in the

u = 2 t = 2 · 3 = 6

The requested number is 36

God with you!!!