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The ages of three siblings total 21 years. The middle child is one year older than the youngest, and the eldest is three times as old as the yougest. How old is each child ?  ( show work )

Guest Jul 19, 2017

Best Answer 

 #1
avatar+25990 
+2

Let y be age of youngest.

 

y + (y + 1) + 3y = 21

 

5y + 1 = 21

 

5 y = 20

 

y = 4. Age of youngest

y + 1 = 5. Age of middle child

3y = 12. Age of oldest child.

Alan  Jul 19, 2017
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1+0 Answers

 #1
avatar+25990 
+2
Best Answer

Let y be age of youngest.

 

y + (y + 1) + 3y = 21

 

5y + 1 = 21

 

5 y = 20

 

y = 4. Age of youngest

y + 1 = 5. Age of middle child

3y = 12. Age of oldest child.

Alan  Jul 19, 2017

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