Question

the unit digit in two digit number is two times the digit in ten's place. if the digit are replace with each other, the number becomes 18 more than the first number. what is the fisrt number​

Answer 1

Answer:

12

Step-by-step explanation:

Let the tens digit be x and the units digit be y

Thus, the number is 10x + y

Given:

y=2x —————(1)

Second condition:

10y + x = 10x + y +18

(Inverted number is 10y+x)

Substitue y=2x

Therefore,

20x + x = 10x + 2x + 18

18x=18

x=1

y=2x

Therefore y=2