Am I that stupid? Solve this math word problem....

Discussion in 'Community Discussion' started by todd2000, Oct 17, 2012.

  1. todd2000 macrumors 68000

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    Danville, VA
    #1
    If a block weighs eight kilograms plus half a block, what is the weight of a block and a half?

    I'll chime in after a few answers...

    Explain your answer please...
     
  2. spork183 macrumors 6502a

    spork183

    Joined:
    Jul 30, 2006
    #2
    if it weighs 8kilo + 1/2 a block (4kilos) = 12 kilos for 1 block. so a block and a half would weigh 18kilos.

    Now, if the word play is to lock in the weight of a block at 8 kilos, then your 1.5 blocks would be 12kilos.

    I'm pretty tired, so if I amusingly punted this one, enlighten (ridicule :D ) me.
     
  3. angelneo macrumors 68000

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    afk
    #4
    1 block weighs 8kg + half a block
    half a block weighs 8kg
    1 block weighs 16kg
    hence, 1 and a half blocks weighs 16+16/2 = 24kg
     
  4. todd2000 thread starter macrumors 68000

    Joined:
    Nov 14, 2005
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    Danville, VA
    #5
    It says the answer is 24, but I'm still stuck at 18...

    If 1 block weighs 8kg + half a block, then how can 1/2 a block weight 8kg?

    It should be 8kg+4kg = 12kg

    1/2 of 12kg = 6kg + 12kg(one block) = 18kg
     
  5. swiftaw macrumors 603

    swiftaw

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    #6
    ok, suppose a block weighs x kg

    Then x = 8 + 0.5 x meaning that 0.5 x = 8 meaning x = 16


    The question says, how much does 1.5 blocks weigh,

    well 1.5*x = 1.5 * 16 = 24
     
  6. ace198 macrumors regular

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    Oct 8, 2007
  7. Hexiii macrumors 65816

    Hexiii

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    Prague, Czech Republic
    #8
    Yeah, it's not that hard, but if you cannot solve it in your mind, just use the equasion above.
     
  8. spork183 macrumors 6502a

    spork183

    Joined:
    Jul 30, 2006
    #9
    ah, quite simple if you use your head. For those like me who locked into the 8kg as a finite weight, think of it like this:
    A block weighs 1/2 a block + 8kg. That makes it easier for me to solve. Your mileage may vary...
     
  9. leftywamumonkey macrumors 6502a

    leftywamumonkey

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    #10
    1 block = 1/2 block + 8kg
    subtract 1/2 block from both sides
    1/2 block = 8kg
    multiply both sides by 2
    1 block = 16kg

    You need to find the weight of 1-1/2 block.

    1block * (1.5) = 16kg * (1.5)
    1.5 blocks = 24kg
     
  10. Scepticalscribe Contributor

    Scepticalscribe

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    The Far Horizon
    #12
    Yes, indeed. ;) The immortal answer to, well,.....The Meaning of Life......and almost everything else, too.
     
  11. angelneo, Oct 18, 2012
    Last edited: Oct 18, 2012

    angelneo macrumors 68000

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    #13
    This might be easier for you to visualize,
    Code:
    1 block = 1/2 block + 1/2 block
    1 block =    8kg    + 1/2 block
    
    Hence,
    1/2 block = 8kg,
    and 1 block = 8x2 = 16 kg
     
  12. Carlanga macrumors 604

    Carlanga

    Joined:
    Nov 5, 2009
    #14
    Should be Y=1.5X so Y=1.5 * total weight(16) = 24. Reminds me of the SAT's
    The key to killing the math part is making every problem like this into a simple formula to solve. Don't get stuck in the semantics of the questions or you will get them wrong.
     
  13. peeaanuut macrumors 65816

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    Sep 10, 2007
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    Southern California
    #15
    the word play is to get you to lock into the number eight. So you hear 8+half and you think 12, then you add half that and get 18. The idea is to get you to actually use formulas and do the math instead of just going off the only visible number which is 8. The actual math, as the formulas have shown equals out to 24.
     
  14. mobilehaathi macrumors G3

    mobilehaathi

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    #16
    Exactly correct. End of thread.
     
  15. samiwas macrumors 65816

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    Atlanta, GA
    #17
    Ah ha! This finally made me understand what on earth people here were saying.
     
  16. millerj123 macrumors 6502a

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    Mar 6, 2008
    #18
    0 credit. You didn't show your work...;)
     

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