Two numbers together add to 300 One number is twice the size

Two numbers together add to 300. One number is twice the size of the other. What are the two numbers?

A. 25; 50

B. 50; 100

C. 75; 150

D. 100; 200

Solution

D. Set this up as an equation. A number plus 2 times that number is 300.

x + 2x = 300

Solve for x.

3x=300

X=100

So one number is 100 and the other is twice that, or 200.