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10 September, 16:39

Marks brother is nine years older then mark. their combined ages add up to 33. how old is mark

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Answers (2)
  1. 10 September, 18:34
    0
    12 yrs old

    Step-by-step explanation:

    Mark (M) + Brother (B) = 33

    M=B-9

    therefore

    (B-9) + B=33

    2B-9=33

    2B=33+9

    2B=42

    B=21

    21-9=M

    M=12
  2. 10 September, 19:40
    0
    Mark is 12 years old

    Step-by-step explanation:

    a=brothers age

    (9+a) + a=33

    (9+12) + 12

    (21) + 12=33

    a=12

    Mark is 12 years old
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