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Question 1199657: janet is three years older than her sister julie. janet's brother is eight years younger than their sister julie. the sum of all their ages is 55 years. what is the equation for the problem?
Answer by math_tutor2020(3817)   (Show Source):
You can put this solution on YOUR website!
It's misleading for your teacher to ask about THE equation, because many equations can be formed.
Here's one way to go about it.
x = Julie's age
x+3 = Janet's age since "janet is three years older than her sister julie"
x-8 = the brother's age since "janet's brother is eight years younger than their sister julie"
Notice how Janet and her brother have their ages dependent on Julie's age.
These three ages sum, or add, to 55 years in total.
Julie + Janet + Brother = 55
(x) + (x+3) + (x-8) = 55
x + (x+3) + (x-8) = 55 is one possible equation to set up.
I'll let the student finish up solving the equation.
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