4.11.2011

Spiders and beetles

I sent you on friday a question about the word-problem we made in class last week. This was my mail:
If you remember the word-problem about spiders and beetles there were only 30 'bugs' in total.  All of them had 152 legs in total (8 per a spider and 6 per a beetle), but we have discovered that this is impossible. According to that I have two questions for you: If there are only 30 individuals...
                 
How many legs at a minimum do we need to make the word-problem correct? How many legs at a maximum? 
I promise a positive mark to those who get the right answer, but this offer will last only for this weekend.
Juan Antonio, Jesús and Rafa got the positive marks, congratulations! Here is the most complete answer from Juan Antonio:
The first answer is: 29x6+8=182
6(30-x)+8x=182
180-6x+8x=182
-6x+8x=-180+182
2x=2
x=1 
There is 1 spider and 29 beetles.
The second answer is: 29x8+6=238
6(30-x)+8x=238
180-6x+8x=238
-6x+8x=-180+238
2x=58
x=29
There are 29 spiders and 1 beetle 
Congratulations!!
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9 comments:

  1. Javi Leiva11/04/2011, 20:31

    Good job!

    ReplyDelete
  2. Anonymous11/04/2011, 21:27

    Hello!
    Excellent job Juan Antonio, Jesús and Rafa!
    Congratulations for the positive marks! =)
    Bye!

    ReplyDelete
  3. Tony Rodriguez =)11/04/2011, 22:27

    Good job , congrulations for you for the positive marks.. Bye! :)

    ReplyDelete
  4. Rafa Díaz12/04/2011, 15:39

    I answer the question on Sunday at 23:30. Ja, ja, ja. When I was brushing my theet, I had the solution!

    Bye :)

    ReplyDelete
  5. Ana Amate:)15/04/2011, 15:17

    Good job friends! Was difficult but now isn't so difficult.
    Bye:)

    ReplyDelete
  6. Ana María :)16/04/2011, 11:26

    Good job Jesús, Rafa and Juan Antonio. The problem is difficult.!

    ReplyDelete
  7. Inma16/04/2011, 11:51

    Very good! The problem was very difficult.
    Bye!

    ReplyDelete
  8. Naza(:18/04/2011, 09:19

    Very good!:D

    ReplyDelete
  9. Anonymous27/04/2011, 16:53

    VERY GOOD!

    ReplyDelete

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