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17 February, 02:34

In a survey of 105 people, there were half as many adults as children. How many children were there?

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Answers (2)
  1. 17 February, 02:39
    0
    70

    Step-by-step explanation:

    Set up a system:

    C + A = 105

    C = 2A

    Substitute:

    3A = 105

    A = 35

    C = 70
  2. 17 February, 02:42
    0
    70 children 35 adults

    Step-by-step explanation:

    X = children

    Y=Adults

    x+y=105

    1/2x=y

    x+y=105

    1/2x-y+0

    x+y+105

    x-2y=0

    3y=105

    y=35

    x+35=105

    x=70
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