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Let Joan's age be x and her sister's be y

Then: x+y=27 and y=x-3

subsitute gives

2x-3=27

2x=30

x=15 (Joan is 15)

Subsitute back

15+y=27

y=12 (sister is 12)

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Q: Joan and her sister have a combined age of 27 Joan is 3 years older how old is Joan?
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