Need Help From a Formula Expert

If you are a brave formula expert looking for a challenge, then please read on! I'm stumped!
I use Numbers to keep track of my reading. I have a sheet for books, where one row is used for one book. I have one column to record the author, one for the title, one for the genre, one for the number of pages etc. The column on the far left is devoted to checkboxes to tell me which books I have finished. I also have one column for the start date and one for the end date. This means that, using formulas, I have set up a column to show me how many pages per day I have read of each book, by figuring out how many days it took me to read a book and then dividing the number of pages by that number of days.
What I want to do now is very complicated:
On a separate sheet, I have set up another table, which I want to tell me my average reading speed (in pages per day) for each genre. I have used the SUMIF function to do this - this function adds up all the 'Pages Per Day' values in rows where the 'Genre' values equal a certain thing (eg 'Fantasy'). I have then used the COUNTIF function to count how many fantasy books there are, so that the sum of the values will be divided by this number. This gives me the average number of pages per day, but only for the Fantasy books.
At this point, I was feeling very pleased with myself - but there is one more problem.
The sheet contains books that I have finished AND books that I have not finished yet. The books which I have finished are marked by a tick in the checkbox. I do not want books I haven't finished yet to be counted in my averages. So what I want to do is modify my formula so that it only counts values in rows where the box in the first column is ticked. I can't figure out how to do this, because the SUMIF and COUNTIF functions only allow you to put one condition in, and I need to put two conditions in - the genre and the checkbox.
In summary - I need a formula to calculate the average of the 'Pages Per Day' values, but only from rows where the genre is fantasy AND the box is ticked!
HELP!!!

There are many ways to think of this, but I think all of them require the introduction of an additional column in the first table. One way is for this new column to have 1's for the books you've finished and 0's for the books you haven't. This can be done with a formula like:
=IF(ISBLANK(EndDate),0,1)
Then, instead of using COUNTIF() in your averaging formulas, you can use SUMIF() on this new column. As such, perhaps you don't need the checkbox column any longer. This sounds redundant with the existence of an EndDate, and would save you the problem of checking and entering a date when you finished a book (and the potential for an inconsistency).
Another, perhaps more general approach, would be to have the new column have a formula like:
=IF(ISBLANK(EndDate),"", Genre)
Then SUMIF()s and COUNTIF()s can be made conditional on this new column.
In any case, if you find this artificial new column unsightly, you can hide it.

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He recibido un cargo de su tienda, que curiosamente he visto que se han hecho muchos cargos a diferentes personas bajo el mismo copncepto y tienda.Favor acreditarme dicho monto porque no he comprado nada con ustedes y ni tengo idea donde está Minesota.Este es mi cargo. 23/07/15323343GEEKSQUAD RENE00015826 RICHFIELD UUSRD$1,428.010.00 Y veo en Internet que otros clientes han hecho reclamos del mismo concepto. Subject Author PostedGEEKSQUAD RENE00015826Care‎03-09-2015 06:30 PMGEEKSQUAD RENE00015826 Unknown ChargePriscillaQ‎12-29-2014 10:08 PMrandom 10 dollar charge from richfield MN to my ac...ChrisBurns‎07-01-2015 12:50 PMUnknown Geeksquad charge on my Credit CardHardingR‎12-01-2014 05:57 PMGeekSquad protection terms changed without being i... Lo que me hace pensar que algo anda muy mal en ese Best Buy. Como es posible que no hayan corregido e identificado quienes están detrás de este fraude que lleva años. I need help from Customer Support. Whatever this charge is on my credit card,jesmann‎10-05-2014 04:52 PM

Hola scj2000-
Muchas gracias por visitar nuestro foro en búsqueda de una explicación al cargo que recién apareció en tu tarjeta de crédito.
Entiendo su preocupación, ya que cualquier cargo extraño que aparece en un estado de cuenta puede ser alarmante. En este caso, el último cargo que puede recuperar usando el correo electrónico que usaste para registrarte al foro, refleja que se renovó un antivirus Kaspersky. Esta autorización nos diste cuando realizaste la compra de tu Lenovo, desde entonces se renueva automáticamente la licencia de antivirus.
Las otras publicaciones que has leído, indican lo mismo. Un cargo que se ha hecho a la tarjeta de crédito que se presentó durante la compra con la autorización del cliente.
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TS1717 This article is vague and unhelpful. My iTunes needs help from a pro. I have over 120,000 songs -- NO movies, TV, radio, or books... I have other programs which efficiently run things which are not audio-based. So why can I not get iTunes working w

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Got it, there was a bug in my code. Here is what you do:
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LOL! wrote:
as the attachment , the blinkblink.vi is the main function i want to do .
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irelative wrote:
When I tried to create a blackberry account on blackberry.orange.ro with my PIN and IMEI, the page replied that my account is disabled and that I should contact my carrier.
Optus is in the only one that can remove the PIN/IMEI from their system. You need to contact them.
If the device has been reported lost or stolen, they won't remove it.
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PIN: C0001B7B4 Display/Scan Bar Code
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