In my number, the digitin the ones place is double the digit in the tens place. The sum of the digits is 3. My number is ?

Question

In my number, the digit in the ones place is double the digit in the tens place. the Sum of the digit is 3. what is my number

Answer 1

Let the number in the tens place = x

Let the number in the ones place = y

 

 

Using this information, we can write a simple equation or two.

 

y = 2x                   eq1

 

x + y = 3                 eq2

 

 

 

We can substitute eq1 into eq2 so that we have only on equation to solve.   Lets get eq1 in terms of x.

 

x + 2x = 3

 

3x = 3

 

 

Divide both sides of the equation by 3.

 

  x = 1

 

 

Next we substitute the value of x into eq1 to solve for y.

 

y = 2(1)

y = 2

 

 

So the number is going to be  12.