Sciencemadness Discussion Board

Math question

Yttrium2 - 14-8-2019 at 08:06

When trying to find the price per item it always confused me which is the numerator and which is the denominator?

While we're at it what's a dividend?




Ok so I buy bulk tobacco, 500 cigarettes worth for $32


Dividing


500 by 32 we get .064

That's how much a cigarette costs me

Is .1 a tenth of a cent?

.06 being a hundredth

And .004 being a thousandth?

------

So it costs me how much? Don't we have to round up to the nearest whole number sorta cause we can't have fractions of a cent?


Eeek if I wanted to cell a penny worth of cigarettes how much would it be?

.64rths of a penny?

DraconicAcid - 14-8-2019 at 08:57

If it's price per item, you divide by the number of items (just like you get mol/L by dividing a number of moles by the number of litres).

$32/500 cigs = 0.064 $/cig, or 6.4 cents/cig. A penny's worth of a cig would be 1/6.4 or 0.15 cigarettes.

Yttrium2 - 14-8-2019 at 12:19

So 1/1000th of a dollar is 1/10th of a cent?

I think I get it. One if those oh duh moments..

Ubya - 14-8-2019 at 15:37


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Sturge11 - 5-9-2019 at 21:38

So if we are talking chemistry here we have a conversion factor that is pretty much 500 cigarettes / 32 $ that reads for every 500 cigarettes we have, there are 32 dollars. With the conversion factor you can flip it and apply it in a number of ways.

.1 is a tenth of anything, depending on the units, which is the most important part of the .1, as it describes what. In the event of 0.064, which is what you got per cigarette, there is no .1, so there is no "tenth" of a cent, however, there is a 0.06 which is a hundredth of dollar, since dollars were the units used in the Denominator (the lower part) of the conversion factor, being the 32 $. and 6 hundredths of a dollar is 6 cents.