24?
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24?
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~
"It is not that I am mad; it is only that my head is different from yours.”
~
Eight years ago Bob was 24.
I always think it's a bit rude if one does get it right away. That Scheherezade, for instance, zipping in there with her '24?' I mean, breathtakingly rude.Originally Posted by billl
Yes, 24 is it. Sher was wise to save the 16 minutes by typing just the number.
Yay! Much obliged that you gentlemen leave the less challenging ones for me to "solve"!
A quick one:
At a cafe, the first 15 customers spend an average of £3 each. After a further 30 customers, the average amount spent rises to £9. What is the average spending by the last 30 customers only?
~
"It is not that I am mad; it is only that my head is different from yours.”
~
...18?yay! Much obliged that you gentlemen leave the less challenging ones for me to "solve"!
A quick one:
At a cafe, the first 15 customers spend an average of £3 each. After a further 30 customers, the average amount spent rises to £9. What is the average spending by the last 30 customers only?
Not the answer I have come up with.
~
"It is not that I am mad; it is only that my head is different from yours.”
~
First 15 customers spend = £3 x 15 = £45
Average for all 45 customers = (£45 + ?)/ 45 = £9
? = total spent by last 30 customers = 8 x 45 = £360 [? = (8 x 45) because (45 + 8 x 45) is the same as (9 x 45)]
average spent by last 30 customers = £360 / 30 = £12
Yeah, that's exactly how I did it, except that at the last stage I divided 360 by 30 and got 18. Algebra I can do. Mental arithmetic - Im useless.
Incidentally, 'wrong' would have done.
It's having shillings part of your currency that created these bad habits.
Tuna Delight
There are four hungry kittens in an 80cm x 80cm kitten cage
- Each kitten can eat 100 ml of Tuna Delight for lunch, before getting full.
- There are two food bowls, each having a circumference of about 30 cm.
- A kitten's paw can absorb/accumulate up to 10 ml of Tuna Delight.
- A kitten's head has a "diameter" of roughly 6 cm.
- Kittens generally don't walk backwards.
Assuming the kittens are in every way as predictable as robots, how can one easily use the minimum amount of Tuna Delight to ensure the proper feeding and filling of the kittens, and what is that minimum amount?
EDIT: The puzzle has been slightly altered and has been re-expressed in post #1275, sorry...
Last edited by billl; 08-31-2011 at 09:46 AM. Reason: added puzzle
I looked at the question and did nothing, knowing it had billl written all over it.
Yep - this is another one to leave to bill.
Bill! Bi-ill! BI.....! ...oh. Hang on....
Bugger.
when feeding livestock a good rule is to give them only what they can clean up in 15 minutes.
However I don't seem to understand this problem. You state each kitten can eat 100ml of food, then ask how much food is needed for 4 of them, - or have I missed something?
Urgh, you're right. I was trying to control the parameters in order to avoid a certain problem, but ended up removing most of "the puzzle" from the puzzle. Let's say that the goal is to give them 100 ml each, but the kittens won't necessarily be full if they have that much. I'll repost with this slight adjustment (only the first criterion is affected).
Four hungry kittens, and we want each to get 100 ml, although each would eat more if they could... (Also, I'm willing to be flexible with the answer if a good explanation can be given.)
Tuna Delight
There are four hungry kittens in an 80cm x 80cm kitten cage
- Each kitten should eat about 100 ml of Tuna Delight for lunch.
- There are two food bowls, each having a circumference of about 30 cm.
- A kitten's paw can absorb/accumulate up to 10 ml of Tuna Delight.
- A kitten's head has a "diameter" of roughly 6 cm.
- Kittens generally don't walk backwards.
Assuming the kittens are in every way as predictable as robots, how can one easily use the minimum amount of Tuna Delight to ensure the proper feeding and filling of the kittens, and what is that minimum amount?
Last edited by billl; 08-31-2011 at 09:47 AM.
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