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How to set up the Double matrix for this ? I get confused [#permalink]

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28 Sep 2008, 00:22

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How to set up the Double matrix for this ? I get confused with which term to fill in which column.

Please see the problem and help me identify the terms which i should fill in the boxes A,B,X and Y.

Of 28 people in the park, 12 are Children and the rest are adults. 8 have to leave at 3 pm; rest do not. If after 3 pm, there are 6 children still in the park, how many adults are still in the park?

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Double Matrix.jpg [ 14.62 KiB | Viewed 1261 times ]

_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

How to set up the Double matrix for this ? I get confused with which term to fill in which column.

Please see the problem and help me identify the terms which i should fill in the boxes A,B,X and Y.

Of 28 people in the park, 12 are Children and the rest are adults. 8 have to leave at 3 pm; rest do not. If after 3 pm, there are 6 children still in the park, how many adults are still in the park?

I am big fan of the matrix. But I do not see any reason why we need to set up a matrix to solve this. I agree that matrix helps, but this problem was pretty straight forward.

That said, I always look for terms in such a way that one is the negation of the other. We need to find events X and !X. Here the point that some one is not a C is that some one is A. It probably is not as open in other problems which say eats lima beans and do not eat lima beans

Thank you guys. The answer for the problem I posted above is 14.

Should we use the Double Matrix method with the following problem? Is there a better way of solving this problem?

There are 58 vehicles in a parking lot. 24 are trucks, 30 are cars, and the rest are vans. 20 Vehicles are red, 16 are blue, and the rest are green. if there are 12 red trucks in the parking lot, 5 blue trucks, 4 red cars, What is the largest possible number of blue cars in the parking lot?

Thanks
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

How to set up the Double matrix for this ? I get confused with which term to fill in which column.

Please see the problem and help me identify the terms which i should fill in the boxes A,B,X and Y.

Of 28 people in the park, 12 are Children and the rest are adults. 8 have to leave at 3 pm; rest do not. If after 3 pm, there are 6 children still in the park, how many adults are still in the park?

I am big fan of the matrix. But I do not see any reason why we need to set up a matrix to solve this. I agree that matrix helps, but this problem was pretty straight forward.

That said, I always look for terms in such a way that one is the negation of the other. We need to find events X and !X. Here the point that some one is not a C is that some one is A. It probably is not as open in other problems which say eats lima beans and do not eat lima beans

icandy, I agree. I think, I just tried with what amitdgr had posted in the question.

This problem can be solved very easily using matrix method. I got answer as 11.Find the solution in attachment

amitdgr wrote:

Thank you guys. The answer for the problem I posted above is 14.

Should we use the Double Matrix method with the following problem? Is there a better way of solving this problem?

There are 58 vehicles in a parking lot. 24 are trucks, 30 are cars, and the rest are vans. 20 Vehicles are red, 16 are blue, and the rest are green. if there are 12 red trucks in the parking lot, 5 blue trucks, 4 red cars, What is the largest possible number of blue cars in the parking lot?

This problem can be solved very easily using matrix method. I got answer as 11.Find the solution in attachment

amitdgr wrote:

Thank you guys. The answer for the problem I posted above is 14.

Should we use the Double Matrix method with the following problem? Is there a better way of solving this problem?

There are 58 vehicles in a parking lot. 24 are trucks, 30 are cars, and the rest are vans. 20 Vehicles are red, 16 are blue, and the rest are green. if there are 12 red trucks in the parking lot, 5 blue trucks, 4 red cars, What is the largest possible number of blue cars in the parking lot?

Thanks

The answer is 11
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg