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29 Dec 2012, 05:28
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In some problems we have 2 quantities and we are given one side is greater than the other how do we choose for example one part is 1000-x and the other as X. Please help out thanks.
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03 Jan 2013, 10:08
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fozzzy
You assign the variable x to one person, say person A spends x. The other one is fixed then. Then B must spend 1000 - x. When you make your desired equation, you will get the value of x. Now you know that person A spends x and B spends 1000 - x. If A spends more, automatically x will be greater than 1000 - x.
You can also go the other way around - B spends x while A spends 1000 - x. Your equation will change now and values of x will change too. Now x will be less than 1000 - x. B spends x and A spends 1000 - x.
The final answer will be the same in both the cases.
or if you talk about the question in OG, you can assign x to stocks that went down and make the equation as
(120/100)x + x = 2420
x = 1100 = stocks that went down
2420 - x = 1320 = stocks that went up
or
you can assign x to stocks that went up and make the equation as
x + (100/120)x = 2420 (x is 20% more than the stocks that went down so x = (120/100)*stocks that went down )
x = 1320 = stocks that went up
2420 - x = 1100 = stocks that went down
Notice that values of x in the two cases are different (since x stands for different things) but overall the answer is the same.
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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Thank you for understanding, and happy exploring!
29 Dec 2012, 12:27
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fozzzy
HI,
I did not get your question properly.
Are you asking if you have two quantities x and 1000-x then which one will be greater?
If yes then it will depend on the value of x. But you cna assume that x > 1000-x which means 2x > 1000 and x> 500 and try solving the problem.
If you get x < 500 then x will be < 500 if not then it will be => 500
