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

Discussion in 'Calculator Requests' started by math_celebrity, Oct 29, 2019.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    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
     

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