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lilai3 Group Title

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!! IT's about ALIENS :) Stephen wants to learn to communicate with the aliens so he spends lots of time with them. For a week he spends at least some time with then everyday. The number of days he spends time with them after noon is one more than the number he spends time with them before noon. The number of days he spends time with them only before noon is half as many as the number he spends time with them only after noon. How many days does he spend time with the aliens both before and after noon? PLEASE USE A VENN DIAGRAM TO SHOW WORK DONE. THX!

  • 2 years ago
  • 2 years ago

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  1. iNeedTheHelp Group Title
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    What does this have to do with math?

    • 2 years ago
  2. iNeedTheHelp Group Title
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    Ohhhh ok nevermind Here is the definition of a venn diagram: A Venn diagram is a diagram that uses circles to illustrate the relationships among sets. Example: The Venn diagram below shows the number of grade 5 students who scored above 50% on Math, above 50% on Science, and above 50% on both Math and Science. From the Venn diagram, we learn that 16 students scored above 50% on Math, 21 students scored above 50% on Science, and 6 students scored above 50% on both Math and Science.

    • 2 years ago
  3. lilai3 Group Title
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    thanks, what a venn diagram is i just need to know how you solve this problem

    • 2 years ago
  4. ChmE Group Title
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    Are you there? I think I have the pieces we just need to put them together

    • 2 years ago
  5. lilai3 Group Title
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    yes i'm here

    • 2 years ago
  6. ChmE Group Title
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    I am missing a number somewhere. I need to reread the question. there is only a total of 7 days!!

    • 2 years ago
  7. ChmE Group Title
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    a = b + 1 (a-c)/2 = (b-c) 7 = a + b - c These are our three equations

    • 2 years ago
  8. lilai3 Group Title
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    ? uhm i'm sorry i stll don't really get it... perhaps explain like what it's taking about cuz like i don't get the one more than the number stuff in the problem...

    • 2 years ago
  9. ChmE Group Title
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    Let a = total aliens after noon Let b = total aliens before noon Let c = # of aliens in both (a-c) is only after noon (b-c) is only before noon From the problem we have 2 equations we can write. a = b + 1 (a-c)/2 = (b-c) We have 2 equations and 3 unknowns so we still can't solve. We need another equation, a total equation. 7 = a + b - c

    • 2 years ago
  10. ChmE Group Title
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    |dw:1353474534849:dw|

    • 2 years ago
  11. ChmE Group Title
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    a = b + 1 (a-c)/2 = (b-c) -> b = (a-c)/2 + c 7 = a + b - c Solve by substitution. 7 = ( b + 1) + b - c 7 = 2b + 1 - c 7 = 2[(a-c)/2 + c] - c 7 = a - c + 2c - c a = 7 b = 6 c = 6 That's a strange answer. I'm going to recheck my equations.

    • 2 years ago
  12. ChmE Group Title
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    I don't see a mistake. a = 7 days after noon b = 6 days before noon c = 6 days both

    • 2 years ago
  13. ChmE Group Title
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    Now I'll answer your questions

    • 2 years ago
  14. lilai3 Group Title
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    ? uhm i'm sorry i stll don't really get it... perhaps explain like what it's taking about cuz like i don't get the one more than the number stuff in the problem...

    • 2 years ago
  15. ChmE Group Title
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    @hartnn can you double check this. My answer seems unlikely although I think my math is sound

    • 2 years ago
  16. ChmE Group Title
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    Okay we'll break down the wording first

    • 2 years ago
  17. ChmE Group Title
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    Let a = number after noon Let b = number before noon It is saying that he spends one more day with them after noon than before noon. Say b is 10. a would have to be 11 right? So we can write this equation b + 1 = a Plugging in our example to see if it works we get 10 + 1 = 11 11=11 check

    • 2 years ago
  18. ChmE Group Title
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    Do you understand that?

    • 2 years ago
  19. lilai3 Group Title
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    sort of?

    • 2 years ago
  20. ChmE Group Title
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    What specifically confuses you about that explanation?

    • 2 years ago
  21. lilai3 Group Title
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    the equation part

    • 2 years ago
  22. ChmE Group Title
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    We want something that represents what is happening. We use variables because we don't know what they are at first.

    • 2 years ago
  23. ChmE Group Title
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    If I told you I was 2 years older than you what equation would you write?

    • 2 years ago
  24. ChmE Group Title
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    your age + 2 = my age

    • 2 years ago
  25. ChmE Group Title
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    Is this helping?

    • 2 years ago
  26. lilai3 Group Title
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    a little sorry my best subject isn't math

    • 2 years ago
  27. lilai3 Group Title
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    oh like if my granpa was twice my age and i was like... 64 that would be 64 X 2 right?

    • 2 years ago
  28. lilai3 Group Title
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    really bad example because grandpas are usually not that age compared to real life

    • 2 years ago
  29. ChmE Group Title
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    ya thats correct

    • 2 years ago
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