Question

The unit digit in a two digit number is two times the digit in ten's place. If the digits are placed with each other, the number becomes 18 more than the first number . What is the first number

Answer 1

Answer:

Step-by-step explanation:

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

According to the condition :

y=2x

2x-y=0.......eq1

And

10y+x=10x+y+18

-9x+9y=18

-x+y=2.........eq2

Hence ,after solving we get

x=2. And. y=4

Therefore the firat number is 2.

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