Nathan B. answered 03/02/18
Tutor
5
(20)
Elementary and Algebraic skilled
Let's start by listing what we know:
a + b = 42 (two numbers together makes 42)
a = 2b (one number is twice as big as the other)
We now have a value for one of our variables, so we can plug it in:
2b + b = 42
Simplify:
3b = 42
Divide both sides by 3:
b = 14
Now that you know b, you can solve for a:
a = 2 * 14
Solve that, and you'll have the other number.