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In what proportion must sugar at $3.1 per pound be mixed [#permalink] ### Show Tags 07 Jul 2004, 11:55 00:00 Difficulty: (N/A) Question Stats: 0% (00:00) correct 0% (00:00) wrong based on 0 sessions ### HideShow timer Statistics This topic is locked. If you want to discuss this question please re-post it in the respective forum. In what proportion must sugar at$3.1 per pound be mixed with sugar at $3.6 per pound, so that the mixture be worth$3.25 per pound?
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08 Jul 2004, 01:28
Logic behind this is that one should pay the same price whether he/she is buying before mixing or after mixing.

Let x1 amount of 3.1 is mixed with x2 amount of 3.6.

So, x1 * 3.1 + x2 * 3.6 = (x1 + x2) 3.25
Solving, we get x1:x2 = 7:3
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08 Jul 2004, 06:11
It might be faster to solve like this -

3.25 - 3.1 = 15 cents.
3.60 - 3.25 = 35 cents

35/15 = 7/3
08 Jul 2004, 06:11
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