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anonymous

  • 5 years ago

in a class with a certain number of students , if one student weighing 50kg is added then average weight of class incereases by 1 kg ,if one more student weighin 50kg is added then the average weight of class increasses by 1.5kg over the original average? what isthe original average weight (in kg) of the class?

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  1. anonymous
    • 5 years ago
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    option are.....4 46 2 47

  2. anonymous
    • 5 years ago
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    a.4 b.46 c.2 d.47

  3. anonymous
    • 5 years ago
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    we have ( Xi + 50 ) / ( n+1) = Xi / n

  4. anonymous
    • 5 years ago
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    ( Xi + 50 ) / ( n+1) = Xi / n + 1

  5. anonymous
    • 5 years ago
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    how to do

  6. anonymous
    • 5 years ago
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    its a long one, there might be a trick

  7. anonymous
    • 5 years ago
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    15. Ralph likes 25 but not 24; he likes 400 but not 300; he likes 144 but not 145. Which does he like: 10 50 124 200 1600

  8. anonymous
    • 5 years ago
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    well what abt......... ‎976 : 684 375 : 225 864 : 512 597 : ?

  9. anonymous
    • 5 years ago
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    you have 2 equations with 2 variables : the initial average weight (Xi) and the initial number of people (n). The 2 equations are : (Xi + 50) / (n+1) = Xi + 1 (Xi + 100) / (n+2) = Xi + 1.5 I'd isolate n and solve it from there

  10. anonymous
    • 5 years ago
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    yea i got answer

  11. anonymous
    • 5 years ago
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    its 47.

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