SOLUTION: A is 4 years older than b,who is 3 times as old as c.if the sum of their ages is 25 how old is b?

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Question 350070: A is 4 years older than b,who is 3 times as old as c.if the sum of their ages is 25 how old is b?
Answer by algae132(1) About Me  (Show Source):
You can put this solution on YOUR website!
Let x represent c's age. So the ages of the other people in terms of c, are:
b = 3x
a = 3x + 4
We know that; a + b + c = 25
Substitute in terms of x.
3x + 4 + 3x + x = 25
7x + 4 = 25
7x = 21
x = 3
We know that b = 3x
So, b = 3(3) = 9