World's 200 Hardest Brain Teasers Read Online Free Page A

With a balance scale to determine the coin that is heavier in only two weighings, how many coins on each side of the balance scale would you weigh first?
    (a) 1 vs. 1
    (b) 2 vs. 2
    (c) 3 vs. 3
    (d) 4 vs. 4
    (e) none of these
    126. One segment of the game show Let’s Make a Deal had three doors—behind one door was a new car and behind each of the other two was a goat. The contestant would win whatever was behind the door he or she chose. The contestant chose one of the three doors, but before it was opened, the host opened up a different door that had a goat behind it. In order to have the greatest chance of winning the car, should the contestant open the door that was his or her original choice or open the remaining door?
    127. The following words were in a sentence in the following sequence: XYere ZYere Xere. What letters do X, Y, and Z represent?
    128. Suppose you can purchase donuts in boxes of 6, 9, and 20. What is the greatest number of donuts you cannot purchase?
    129. In 10 seconds, with or without a calculator, what is the value of 2/3 x 3/4 x 4/5 x 5/6 x 6/7?
    130. LIAR : MENDACIOUS ::
    (a) disease : toxic
    (b) artist : creative
    (c) conductor : symphonic
    (d) pygmy : undersized
    (e) fib : concerned
    131. What is the next letter in the following series: a l b e m f i n j ?
    (a) l
    (b) m
    (c) o
    (d) p
    (e) q
    132. Suppose you have three Scrabble tiles: N, T, and O. What is the probability that when you randomly place the three tiles upright in a row, they spell an English word?
    133. What is the value of the sum of the first 99 consecutive integers? (In other words, what is 1 + 2 + 3 + 4 +…+ 99?)
    134. Suppose we have the sequence (1), (2,3), (4,5,6), (7,8,9,10), (11,12,13,14,15)…where (1) is the first part of the sequence (2,3) the second part, etc. What is the first number of the 100th part of the sequence?
    135. In an isosceles triangle, ABC, AB = AC, and angle A = 20°. Point P is on side AC such that AP = BC. Find angle PBC.

    136. P is a point inside a square ABCD such that PA = 1, PB = 2, and PC = 3. What is the measure of angle APB?

    137. Which two words do not belong with the others?
    (a) fallible
    (b) congruous
    (c) flammable
    (d) famous
    (e) exact
    138.

    Given:BAC = 20°
ABC =ACB
ABE = 20°
DCA = 30°
BED = ?
    And do it without trigonometry!
    139. I throw a five-cent coin and a ten-cent coin in the air. If one of them lands as a head, what is the probability that the five-cent coin will land as a head?
    (a) 1/3
    (b) 1/2
    (c) 2/3
    (d) 3/4
    (e) 7/8
    140. Three items in a department store are sold with successive discounts.
    The first is sold with successive discounts of 60 percent and 40 percent.
    The second is sold with successive discounts of 50 percent and 50 percent.
    And the third is sold with successive discounts of 30 percent and 70 percent.
    Which of the following is true:
    (a) The equivalent single discount of all three items is the same, but not 100 percent.
    (b) The equivalent discount of each of the three items is between 70 percent and 80 percent.
    (c) The equivalent discount of each of the three items is between 80 percent and 90 percent.
    (d) The equivalent discount of each of the three items is 100 percent.
    (e) None of the above statements is true.
    141. You have an empty three-gallon bottle and an empty five-gallon bottle. How can you measure exactly one gallon of milk without wasting any milk?
    142. You have three playing cards lying face up, side by side. A five is just to the right of a two. A five is just to the left of a two. A spade is just to the left of a club, and a spade is just to the right of a spade. What are two possible layouts for the three cards?
    143. If the following four statements are presented, which one of them is true?
    (a) The number of false statements here is one.
    (b) The number of false statements here is two.
    (c) The number of false statements here is three.
    (d) The number of false statements here is four.
    144. Find a four-digit