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Math Question...
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View this Thread in Original format
| VDub |
OK all you smart college types...
Billy has two chunks of copper alloy...
one is 60% copper and the other is 40% copper...
He melts the two together and the resulting piece weighs 400g and is 51% copper...
How much did each of the original chunks weigh???? |
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| junkie_vince |
| who the is billy? |
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| Vivid Boy |
| quote: | Originally posted by VDub
OK all you smart college types...
Billy has two chunks of copper alloy...
one is 60% copper and the other is 40% copper...
He melts the two together and the resulting piece weighs 400g and is 51% copper...
How much did each of the original chunks weigh???? |
george brown college, plumbing? |
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| VDub |
| quote: | Originally posted by Vivid Boy
george brown college, plumbing? |
LOL...
Actually I work right kitty corner to George Brown...
And I'm not a plumber....
This was a question on my lil bro's homework and he needed help...
I think I figured it out but wanted to confirm... |
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| VDub |
| quote: | Originally posted by junkie_vince
who the is billy? |
Billy's your boy... |
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| VDub |
| quote: | Originally posted by cammaxwell
204g |
There are two pieces........
So you're saying that the second one was 196g??? |
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| cammaxwell |
sorry, I read the question wrong...
one peice is 220g (60%)
one peice is 180g (40%) |
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| ChemEnhanced |
| my head is going to explode. |
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| VDub |
| quote: | Originally posted by cammaxwell
sorry, I read the question wrong...
one peice is 220g (60%)
one peice is 180g (40%) |
no...you're reading it wrong...
The 60 and 40% are the copper content of the original 2 pieces...
When they are melted, the resulting piece is 51% copper... |
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| VDub |
| quote: | Originally posted by ChemEnhanced
my head is going to explode. |
I'm glad ppl are feeling like I did last night with this problem.... |
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| cammaxwell |
| quote: | Originally posted by cammaxwell
sorry, I read the question wrong...
one peice is 220g (60%)
one peice is 180g (40%) |
400g x 51% = 204g of copper so...
2 pieces, one 220g and one 180g (220+180=400)
220g x 60% = 132g of copper
180g x 40% = 72g of cooper
132g + 72g = 204g of copper OR 51% of the 400g chunk |
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