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20 September, 21:02

Matthew is 7 years older than twice the age of his sister. If Matthew is 13, how old is his sister?

3

4

10

33

+5
Answers (2)
  1. 20 September, 21:08
    0
    The answer is a 3. because Matthew is 7 years older than twice the age of his sister. Also Matthew is 13 so the answer is A 3.
  2. 20 September, 23:19
    0
    Let sister be s. Matthew, M

    Matthew is 7years older than twice the age of his sister

    M = 7 + 2s

    13 = 7 + 2s. 7 crosses the equality to other side and becomes - 7

    13 - 7 = 2s

    6 = 2s Divide both sides by 2

    6/2 = 2s/2

    3 = s

    Sister is 3 years old.
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