one number is twice a second number. the sum of those numbers is 45

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one number is twice a second number. the sum of those numbers is 45.

Let the first number be x and the second number be y. We're given:

1. x = 2y
2. x + y = 45

Substitute Equation (1) into Equation (2):
2y + y = 45

Typing this equation into our search engine, we get:
y = 15

Plug this into equation (1) to solve for x, and we get:
x = 2(15)
x = 30