Really hard IQ test(1)
Level
1
Some months have 30 days. While some months have 31 days. How many months have 28 days?
1
12
9
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1 solution
January has : 31 days
February has : 28/29 days
March has: 31 days
April has : 30 days
May has : 31 days
June has: 30 days
July has : 31 days
August has :31 days
September has : 30 days
October has : 31 days
November has : 30 days
December has : 31 days
hence all of the months have at least 28 days
or more
every month's duration is above 28 days
so all of the(12) months have 28 days