Michelle is 7 years older than her sister Joan, and Joan is 3 years younger than their brother Ryan. If the sum of their ages is
64, how old is Joan?
16
22
18
19
1 answer:
Answer:
(C) 18
Step-by-step explanation:
We can create a systems of equations. Assuming
is Michelle's age,
is Joan's age, and
is Ryan's age, the equations are:



We can use substitution, since we know the "values" of m and j.


So we know that Joan is 18 years old.
Hope this helped!
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were solving for t and we know:
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