Question

4. The sum of the digits of a two digits number is 12, and the ten’s digit is one third
of the units digit
. What is the number?
b. 54
d. 39
a. 93
C. 48
​

Answer 1

Answer:

39

Step-by-step explanation:

Let the tens digit number be x

let the unit digit number be y

let the original number be 10x+y

By condition 1

x+y=12-------1

By condition 2

x=(1/3)y

3x=y------2

substituting 2 in 1

x+y=12

x+3x=12

4x=12

x=3--------3

substituting 3 in 1

x+y=12

3+y=12

y=12-3

y=9---------4

Substituting 3 and 4 in 1

10x+y

10(3)+9

30+9

39

:D

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