Double row of boxes, then circle / 'pie chart' puzzle

Complex numbers, rational functions, logarithms, sequences and series, matrix operations, etc.
honest_denverco09
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Double row of boxes, then circle / 'pie chart' puzzle

I have 2 pictures :

First,

Find the rule of the first two pictures and then identify the value of the circle in the third row!

Second,

Find the missed number in this pie!

Thanks to my stupidness !
Last edited by honest_denverco09 on Mon Apr 13, 2009 10:51 pm, edited 3 times in total.

stapel_eliz
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My shoulder-surfing (and very annoying) twelve-year-old almost immediately suggested the following:
If it's in the top row of boxes, you add it; if it's in the bottom row of boxes, you subtract it. The circle is the answer.

stapel_eliz
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After I'd posted the earlier reply, you added another exercise. Since edits don't show up as new postings, I'd nearly overlooked this. In future, please post new questions as new posts. Thank you!

Hint: Multiply across the center....

honest_denverco09
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Re: Double row of boxes, then circle / 'pie chart' puzzle

I am sorry about that!
But i still don't get it, what do you mean with multiply across the center of this circle ? I mean how ?

stapel_eliz
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The circle has a center; it's where all the pie-wedges meet.

Look at the numbers in wedges on opposite sides of the center.

honest_denverco09
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Re: Double row of boxes, then circle / 'pie chart' puzzle

As you said, for example, one of the opposite pairs is 2 and 18, or 6 and 6. So, how can i multiply them as your advise ?Actually i don't make sense with "multiply across the center" !Please explain again for me! Thanks a lot!

stapel_eliz
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If you're not able to multiply 12 by 3 or 6 by 6 on your own, try using a calculator!

honest_denverco09
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Joined: Tue Mar 31, 2009 2:06 am
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Re: Double row of boxes, then circle / 'pie chart' puzzle

Ok. i got it. ^^!
Thank!