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anonymous

  • one year ago

A spinner is divided into many sections of equal size. Some sections are red, some are blue, and the remaining are green. The probability of the arrow landing on a section colored red is 9 over 20. The probability of the arrow landing on a section colored blue is 6 over 20. What is the probability of the arrow landing on a green-colored section?

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  1. jim_thompson5910
    • one year ago
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    hint: all of the probabilities must add to 1

  2. anonymous
    • one year ago
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    does anyone understand this

  3. anonymous
    • one year ago
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    so what does it mean?

  4. jim_thompson5910
    • one year ago
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    x = probability of landing on green \[\Large \frac{9}{20}+\frac{6}{20}+x = 1\] are you able to solve for x ?

  5. anonymous
    • one year ago
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    no cause i have lots of math to do

  6. anonymous
    • one year ago
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    ill try

  7. jim_thompson5910
    • one year ago
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    first combine the fractions on the left side

  8. jim_thompson5910
    • one year ago
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    tell me what you get

  9. anonymous
    • one year ago
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    |dw:1438823076684:dw|

  10. jim_thompson5910
    • one year ago
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    good

  11. jim_thompson5910
    • one year ago
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    we have this now \[\Large \frac{15}{20}+x = 1\]

  12. jim_thompson5910
    • one year ago
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    subtract 15/20 from both sides \[\Large \frac{15}{20}+x = 1\] \[\Large \frac{15}{20}+x-\frac{15}{20} = 1-\frac{15}{20}\] \[\Large x = 1-\frac{15}{20}\] \[\Large x = ???\]

  13. anonymous
    • one year ago
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    idk

  14. jim_thompson5910
    • one year ago
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    try to think of the "1" as "20/20"

  15. anonymous
    • one year ago
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    14/20

  16. jim_thompson5910
    • one year ago
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    try again

  17. jim_thompson5910
    • one year ago
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    \[\Large x = 1-\frac{15}{20}\] \[\Large x = \frac{20}{20}-\frac{15}{20}\] \[\Large x = ??\]

  18. anonymous
    • one year ago
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    5/20

  19. jim_thompson5910
    • one year ago
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    correct, which reduces to 1/4

  20. anonymous
    • one year ago
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    which is the answer

  21. jim_thompson5910
    • one year ago
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    5/20 is equivalent to 1/4. I just reduced

  22. jim_thompson5910
    • one year ago
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    it's always a good idea to reduce fractions as much as possible

  23. anonymous
    • one year ago
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    that is nt an answer choice

  24. anonymous
    • one year ago
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    @jim_thompson5910

  25. jim_thompson5910
    • one year ago
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    what answer choices do they give you?

  26. anonymous
    • one year ago
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    The probabilities are equal. The probability of landing on the open end is greater. The probability of landing on the closed end is greater. No conclusion can be made.

  27. anonymous
    • one year ago
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    @jim_thompson5910

  28. jim_thompson5910
    • one year ago
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    this was for a different problem

  29. anonymous
    • one year ago
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    opps let me send the actual chocies

  30. anonymous
    • one year ago
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    15 over 20 11 over 20 6 over 20 5 over 20

  31. jim_thompson5910
    • one year ago
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    so it looks like they didn't reduce the fraction, which is odd

  32. jim_thompson5910
    • one year ago
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    so just don't reduce 5/20

  33. anonymous
    • one year ago
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    kk

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