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kristin
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the ages of two brothers are in the ratio two to three,but in eight years the ratio of ther ages will be three to four .findtheir presentage
 3 years ago
 3 years ago
kristin Group Title
the ages of two brothers are in the ratio two to three,but in eight years the ratio of ther ages will be three to four .findtheir presentage
 3 years ago
 3 years ago

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julie Group TitleBest ResponseYou've already chosen the best response.0
hmmmm, so you want to turn this into a series of equations based on the rules outlined in the word problem. and then solve them.
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
so how can you write one of the equations given the first piece of information?
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
e.g. \[y = 2x/3\]
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
where y = younger, and x = older
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
but since there are two variables in this problem, you need a second equation to solve
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
(the two present ages are the two variables)
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
so we know in 8 years, that the ratio will actually be 3/4, not 2/3
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
so: y+8/x+8 = 3/4
 3 years ago

julie Group TitleBest ResponseYou've already chosen the best response.0
now that you have two unknown variables (the present ages), and two equations, you can solve the problem by substituting the first (y=2x/3) into the second.
 3 years ago

kristin Group TitleBest ResponseYou've already chosen the best response.0
thank you :)
 3 years ago
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