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26 January, 17:50

If you have two numbers and add the first number to 4 times the second, you would get 30. If the second number is added to 4 times the first, you would get 15. What are the two numbers?

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Answers (2)
  1. 26 January, 18:11
    0
    The first number is 2 and the second number is 7.
  2. 26 January, 21:04
    0
    the first number is 2 and the second number is 7

    Step-by-step explanation:

    Make 2 simultaneous equations:

    1st number = x

    2nd number = y

    X+4y=30

    Y+4x=15

    Times one equation by 4:

    4x+16y=120

    Then solve by subtracting the two equations:

    4x+16y=120

    -

    Y+4x=15

    = 15y = 105

    Y=7

    Then substitute y in to find x:

    X+4 (7) = 30

    X + 28=30

    X = 2

    Therefore the first number is 2 and the second number is 7
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