Question 253447: Mary is three times older than Joseph the sum their ages is 29
Answer by Nikki456(9)   (Show Source):
You can put this solution on YOUR website! Since you didnt specify what the question was, I assume that you meant to find their ages. You could let mary be represented as x and joseph be represented as y. So you could set up two equations and substitute:
1)3y=x
2)x+y=29
You substitute equation 1 into 2. you get
3) 3y+y=29
simplify:
3)4y=29
y:7.25
To find Mary's age, you could plug in your answer for Joseph into the first equation.
1)3(7.25)= 21.75
So your answer would be:
Mary= 21.75 or 21 3/4 yrs old
Joseph= 7.25 or 7 1/4 yrs old
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