# Math help!

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

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1. ### 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!

2. ### flojobGold Supporting Member

Oct 15, 2011
X=.53? Who knows

3. ### 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. ### Spectre1966Striving For MediocritySupporting Member

Jul 4, 2014
Wallingford, CT
Cross multiply and divide
3x/10=16
3x=160
X=160/3

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5. ### fdeckSupporting MemberCommercial User

Mar 20, 2004
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?

6. ### twelvetrombonesMartian AmbassadorGold 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 DeCosaHabitual Line-StepperSupporting MemberCommercial User

Mar 9, 2008
Vero Beach, Florida
DiCosimo Audio

8. ### flojobGold 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.
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 CrabACME,QSC,Fame/Hondo/Greco/HELIX user & BOSE AbuserGold 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. ### 5StringBlues

Feb 26, 2009
Here we are...
Gazintas is not my forte.

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11. ### Old Garage-Bander

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. ### flojobGold Supporting Member

Oct 15, 2011
It's today!

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13. ### jmleeCatgut? 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. ### buldog5151bassKibble, milkbones, and P Basses. And redheads.

Oct 22, 2003
Connecticut
What's the name of the bus driver?

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15. ### GizmotSupporting Member

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

16. ### 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. ### Spectre1966Striving For MediocritySupporting Member

Jul 4, 2014
Wallingford, CT
40 mins.

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18. ### tubestuff

Aug 14, 2013
San Pedro, CA
Hi Spectre,
How the heck would that look in a formula? And thanks!

19. ### line6man

Lots of solutions, but no one has offered a proof! As a mathematician, I'm not amused.

20. ### twelvetrombonesMartian AmbassadorGold 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.