SOLUTION: brittany is 5 years older than three times the age of her brother. The sum of their ages is 21. if x represents the age of her brother, write an equation that represents this situa

Question 729473: brittany is 5 years older than three times the age of her brother. The sum of their ages is 21. if x represents the age of her brother, write an equation that represents this situation
Found 2 solutions by erika514, stanbon:
Answer by erika514(39) (Show Source): You can put this solution on YOUR website!
Hi, for this one we know we are going to have x to represent Brittany's brothe's age and since Brittany is five years older, that means she is plus five years, or we are going to add five years to x to find her age. So our equation for this situation is x+5=21. Hope this helps and let me know if you have any more questions. :)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
brittany is 5 years older than three times the age of her brother. The sum of their ages is 21. if x represents the age of her brother, write an equation that represents this situation
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Equations:
t = 3b + 5
t + b = 21
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Substitute for "t" and solve for "b":
3b+5+b = 21
4b = 16
Brother's age = 4 years
Brit's age = 3*4+5 = 17 years
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Cheers,
Stan H
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