Question 1106134
Alfredo is 5 years older than john 
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John's age = J
Alfredo's age = J+5
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and Maria is 4 years  younger than john. 
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Maria's age = J-4
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If the SUM of their ages is 34,
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John's age + Alfredo's age + Maria's age = 34
     J     +      J+5      +      J-4    = 34
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what equation can be used to find John's age?
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Get it all together:

J + J+5 + J-4 = 34
         3J+1 = 34

You finish.

Edwin</pre>