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OpenStudy (billygoat119):
There is a difference of 9 years between the oldest and youngest child in the Petronides family. If the sum of their ages is 17 years, which equation describes y, the age of the youngest child?
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OpenStudy (mrnood):
so if x = age of oldest and y = age of youngest how would you write "the sum of their ages is 17 years" using just maths symbols?
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