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3 December, 06:47

The sum of two numbers is 21. the second number is six times the first number. work out the two numbers

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Answers (2)
  1. 3 December, 07:11
    0
    3 and

    18

    Step-by-step explanation:

    Let the two numbers be A and B

    Given the sum of the two numbers is 21.

    That's

    A + B = 21

    The second number is 6 times the first.

    That's

    B = 6A

    We now have two equations

    Equation 1: A + B = 21

    Equation 2: B = 6A

    Now substitute 6A for B in equation 1

    We have

    A + 6A = 21

    7A = 21

    Divide both sides by 7

    A = 21/7

    A = 3

    Substitute 3 for A in either of the equations to get B.

    Using equation 2, we have

    B = 6A

    B = 6 x 3

    B = 18

    The numbers are 3 and 18
  2. 3 December, 09:45
    0
    3 and 18

    Step-by-step explanation:

    x+6x=21

    7x=21

    x=3
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