Nov/Dec ’18 Brain Teasers

1.  Check out this Krazy Pic from the 10/29 mailing.  Why do we know this picture probably came from Great Britain, say, rather than the US? (I just noticed there is ALSO another subtle semi-clue – anyone catch it?)
2.  Check out this riddle.  Interesting, and ‘outside the box’.  (I’d probably change the question to ‘of the four names here, which is most likely . . .’, but hey.)
Here (#3 & #4) are a couple of almost-repeats from three years ago (October, 2015):
3.  J.J.J. Smith has an 85 average on his four tests in Calculus.  The final is the same weight as each test – all are 100 points.  What will he need to score on the final, to bring his grade up to an A (90 average)?
4. If you write down every whole number (integer) between 500 and 700, how many times will you write the digit 6?
5.  I’m Rodney and I live on a farm.  With me are 4 other dogs named Brownie, Spot, Fido, and Blackie. There is a fifth dog – what is it’s name?
6.  Ralph went for 5 days without sleep. He felt and acted perfectly normal.  Why is that?
7.  How is your mother’s sister’s brother in law related to you?
8.  Always, sometimes, or never?  A)  A right triangle has an acute angle.  B) A right triangle has an obtuse angle. 
9.  Always, sometimes, or never:  A)  The radius of a circle is longer than the diameter.  B)  A triangle with 2 equal sides is equilateral.
10. If p is a prime and  2p – 1 is also prime, then 2p – 1 is called a Mersenne Prime.  Find the three smallest Mersenne primes.
11.  I am divisible by 5 and I am odd.  I have less than 4 digits, but am greater than 12 x 12.  The sum of my digits is a square and their product is 15.  What number am I?
12.  Find the area and perimeter of a right triangle with legs of 4 & 5.

4 thoughts on “Nov/Dec ’18 Brain Teasers

  1. 9a never
    9b sometimes;if not isosceles.
    11 315
    12 area is 6sq units and
    perimeter is 12 units.

Comments are closed.