Look at the following sentence once and once only, how many times can you find the letter F?
Furry foxes of far origin often come of age far before scientific study forecasts.
[Ref: ZBCD] © Kevin Stone
Answer: There are 10 letter Fs.
Many people fail to see them all on the first reading, especially if this sentence is read aloud.
Try this puzzle on your friends - you will be amazed.
The following words have had their vowels removed, can you find the missing animals?
[Ref: ZRJI] © Kevin Stone
Hint: One of the words is GOAT.
SLTH >> SLOTH
RCN >> RACOON
MNKY >> MONKEY
LLGTR >> ALLIGATOR
LPHNT >> ELEPHANT
LND >> ELAND
GT >> GOAT
BR >> BEAR (OR BOAR)
BBN >> BABOON
CYT >> COYOTE
Daniel has the same number of brothers as sisters.
His sister, Laura, has twice as many brothers as she has sisters.
How many boys and girls are in the family?
[Ref: ZHNZ] © Kevin Stone
Hint: A little bit of algebra might help.
Answer: There are four boys and three girls.
If we call the number of boys B, and girls G...
From the first statement (we take one off as Daniel is a boy):
B - 1 = G
2 * (G - 1) = B
Substitute G from the first equation into the second equation to give:
2 x ((B - 1) - 1) = B
2 x (B - 1) - 2 = B
2 x B - 2 - 2 = B
2 x B - 4 = B
B = 4
which means that B = 4 and hence G = 3. QED.
My bath has two taps and a plug hole - and a leak!
The cold tap on its own fills the bath in 20 minutes, the hot one in 30 minutes.
The plug hole can drain the bath in 16 minutes with the taps off.
The leak would empty a full bath in 2 hours.
How long will the bath take to fill if I leave both taps on with the plug left out?
[Ref: ZVUO] © Kevin Stone
Hint: How many baths could be filled in 24 hours?
Answer: 80 minutes.
In 24 hours:
- the cold tap could fill 72 baths
- the hot tap could fill 48 baths
- the plug could drain 90 baths
- the leak could drain 12 baths
Therefore, in 24 hours, we have 72 + 48 - 90 - 12 baths full = 18 baths.
Therefore each bath would take 80 minutes to fill.