w= weight of marks sister

w= weight of marks sister

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I thought of it similarly to what Robert had answered...translate the words and numbers into math language:

Mark and sister together weigh 74 + S =

Six more pounds than three times sister's weight 3S + 6

Then solve for S (sister's weight)

74 + S = 3S + 6

68 = 2S (Subtract 6 and S from both sides)

S = 34 ( Divide both sides by 2)

Sister is 34 lbs!

Let W = the weight of Mark's sister.

74+W = 3W+6

Solve for W,

W = 34 lb <==Answer

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