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Math help!

Discussion in 'Miscellaneous [BG]' started by musicman666, Nov 23, 2017.


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  1. musicman666

    musicman666

    Sep 11, 2011
    ca
    Can someone explain how to solve for x in this particular equation...I can't seem to figure it out, not back in class until after holiday. Dont want answer just an example on how to solve. Thank you!
    15114784070431493535336.
     
  2. flojob

    flojob Gold Supporting Member

    Oct 15, 2011
    X=.53? Who knows
     
  3. Gorn

    Gorn

    Dec 15, 2011
    Queens, NY
    This is your basic cross multiply and divide right? So 16=30x? I stink at math but if that's not it than I'll be very surprised.
     
  4. Spectre1966

    Spectre1966 Striving For Mediocrity Supporting Member

    Jul 4, 2014
    Wallingford, CT
    Cross multiply and divide
    3x/10=16
    3x=160
    X=160/3
     
    mikeyjm2, basscapes, BEADG63 and 6 others like this.
  5. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    The way my mom taught me algebra, you can do anything to one side of the equation, so long as you do the same thing to the other side. Exceptions are multiplying and dividing by zero. So you could: Take the reciprocal of both sides, or multiply both sides by (X/10) for instance. Try a few things along those lines.

    Another way of thinking about it: What if it was just X instead of X/10... how would you solve it?
     
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  6. twelvetrombones

    twelvetrombones Martian Ambassador Gold Supporting Member

    Aug 25, 2017
    Portland, OR
    3/4 = 4/(x/10)

    If you divide by a fraction it is equivalent to multiplying by the inverse of that fraction. Therefore 3/4 = 4*10/x = 40/x

    so 3 x = 160

    x = 160/3.
     
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  7. Dominic DeCosa

    Dominic DeCosa Habitual Line-Stepper Supporting Member Commercial User

    Mar 9, 2008
    Vero Beach, Florida
    DiCosimo Audio
    IMG_20171123_184302-759x1012.
     
  8. flojob

    flojob Gold Supporting Member

    Oct 15, 2011
    3/4 is .75
    At the end, .75 is gonna get divided by 10, which is gonna move that decimal to 7.5.
    So that x that's dividing your 4 needs to have 7.5 as your answer.
    What divides 4 with an answer of 7.5
    .53.
    I made up other things too.
    Get rid of stuff.
    Multiply the reciprocal of x/10 to both sides.
    X/10 times 10/x. Get out of here.
    10/x times 3/4. 30/4x can stay. He's a nice guy.
    Now it's 30/4x = 4. Fractions are pretentious, so call it 7.5x=4.
    Get rid of stuff.
    Liberate that x by dividing both sides by 7.5.
    X=.53

    I'm making all this up. But happy Thanksgiving
     
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  9. Johnny Crab

    Johnny Crab ACME,QSC,Fame/Hondo/Greco/HELIX user & BOSE Abuser Gold Supporting Member

    Feb 11, 2004
    South Texas
    Is it strange to be able to do this in your head?
    Disclaimer: closet math lover.....Oliver Heaviside is one of my heroes.
     
  10. Gazintas is not my forte.
     
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  11. OH frick! I give up.

    Car A traveled west at 35 mph.
    Car B traveled east at 40 mph.
    If both cars travel for 2-1/2 hours, what day is it?
     
  12. flojob

    flojob Gold Supporting Member

    Oct 15, 2011
    It's today!
     
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  13. jmlee

    jmlee Catgut? Not funny. Supporting Member

    Jun 16, 2005
    Halifax, Nova Scotia
    Q: If a man-and-a-half can dig a hole in a day-and-a-half,
    How many pancakes does it take to shingle a doghouse?
    A: Almost as many as fifteen because no matter how
    sharp you keep your toothbrush, you can't cut down a
    telephone pole with a shoelace.
    QED

    Seriously, my first degree's in Mathematics. It's 160/3 alright. Smart bunch here.
     
  14. buldog5151bass

    buldog5151bass Kibble, milkbones, and P Basses. And redheads.

    Oct 22, 2003
    Connecticut
    What's the name of the bus driver?
     
    Wisebass and Spidey2112 like this.
  15. Gizmot

    Gizmot Supporting Member

    Mar 22, 2009
    Nashville area
    Does this have anything to do with playing bass, bass or audio gear?
     
  16. tubestuff

    tubestuff

    Aug 14, 2013
    San Pedro, CA
    This one always screwed me up, still does, messed me up on a job interview.

    If it takes one faucet one hour to fill a sink, how long does it take to fill a sink with the same faucet and another faucet flowing at 1/2 the rate of the first.
     
  17. Spectre1966

    Spectre1966 Striving For Mediocrity Supporting Member

    Jul 4, 2014
    Wallingford, CT
    40 mins.
     
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  18. tubestuff

    tubestuff

    Aug 14, 2013
    San Pedro, CA
    Hi Spectre,
    How the heck would that look in a formula? And thanks!
     
  19. Lots of solutions, but no one has offered a proof! As a mathematician, I'm not amused. :p
     
  20. twelvetrombones

    twelvetrombones Martian Ambassador Gold Supporting Member

    Aug 25, 2017
    Portland, OR
    One faucet fills the volume of the sink in a certain time (1 hour). flow rate 1 = volume/time 1. Adding a second faucet at half the flow rate of the first, so rearranging slightly time 2 = volume/(1.5 * flow rate 1) = 1 hour/1.5 = 40 min.
     

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