One number is twice a second number. The sum of those numbers is 45. Find the numbers.

x + 2x = 45

3x = 45

x = 15

What is the other number?

the sum of 2 numbers is 36. the first number is twice the second number. what is the 2nd number?

15

12

To solve this problem, let's represent the two numbers using variables. Let's call the first number "x" and the second number "y".

According to the given information, we know that "One number is twice a second number". This can be written as:

x = 2y

The sum of those numbers is 45. So we can also write another equation:

x + y = 45

Now we have a system of two equations:

x = 2y
x + y = 45

To solve this system of equations, we can use the substitution method. Let's solve for x in the first equation:

x = 2y

Now substitute this value of x in the second equation:

2y + y = 45
3y = 45
y = 45 / 3
y = 15

Now substitute this value of y back into the first equation to find x:

x = 2 * 15
x = 30

So the two numbers are x = 30 and y = 15.