Question 891159: 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 youngest. How old is each child? Set up and solve the system.
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! let the ages of the 3 kids be a, b, c
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Write an equation for each statement
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The ages of three siblings total 21 years.
a + b + c = 21
The middle child is one year older than the youngest,
b = c + 1
and the eldest is three times as old as the youngest.
a = 3c
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Om the first equation replace a with 3c and b with (c+1)
3c + (c+1) + c = 21
5c = 21 - 1
c = 20/5
c = 4 yrss old
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I'll let you find a and b, check your solutions in the 1st equation
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