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Sara's age is 7 more than antonio's age.Two times Antonio's age plus 3 times sara's age is equal to 36. How old are they?
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s = a + 7, (1)
2a + 3s = 36. (2)
Substitute expression (1) for s into (2). You will get a single equation for a:
2a + 3*(a+7) = 36,
2a + 3a + 21 = 36,
5a = 36 - 21 = 15,
a = 3.
Antonio is 3 years old.
Sara's age is 3 + 7 = 10 years.
