reasoning
Maths Puzzle
I think all sane people are cachers
and one third of all cachers are sane
but half of all whackos are cachers
with only one whacko that s sane
If eight whackos are cachers
and ninety are attending my ball
how many cachers are neither
sane nor whacko at all?
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reasoning Other Question
Two friends, whom we will call Arthur and Robert, were curators at the Museum of American History. Both were born in the month of May, one in 1932 and the other a year later.
Each was in charge of a beautiful antique clock. Both of the clocks worked pretty well, considering their ages, but one of them lost ten seconds an hour and the other gained ten seconds an hour.
On one bright day in January, the two friends set both clocks right at exactly 12 noon.
``You realize,'' said Arthur, ``that the clocks will start drifting apart, and they won't be together again until---let's see---why, on the very day you will be 47 years old. Am I right?''
Robert then made a short calculation. ``That's right!'' he said.
Who is older, Arthur or Robert?
A person crosses a river on a paddle boat.
He took 4 hours while paddling against the water flow
and 3 hours while paddling in the direction of the water flow.
On still waters, how long would he take?