1260 Challenging Brain Teasers Page 57 of 84
Difficult brain teasers are the ones that make you think hard to solve them, but make you feel smart when you get the answers.
841. All the vowels (including "y") have been removed from the following quotation. Can you read it?
FLSRSHNWHRNGLSFRTTRD
842. Dr. Plex is the proud owner of two ancient mummies. His colleagues are testing him. One mummy is painted red on both sides. The other is red on one side and white on the other side. They randomly select a mummy, and Plex can see only the top surface, which turns out to be red. What is the probability that the other side is red? If Plex is a gambler, should he bet that the other side is red?
843. To what part of the human body do the words entropion, episclera, and keratitis refrer?
844. What 2 words, formed from different arrangements of the same seven letters, can be used to complete the sentence below?
Two hundred years ago, wild bar ________ in some port cities were often interrupted by ________ who kidnapped customers as coin.
845. Here's a money analogy for you.
100 cents is to 1 dollar as
100 centesimos is to 1 _____ ( in what country ).
846. Mary was working in a chemistry lab with a mixture of chemicals that was 90 percent water and weighed 20 pounds (equal portions of water and the chemical mixture weigh the same). After returning to the lab from a weekend break, Mary calculated the mixture which was now 50 percent water. How much does the mixture now weigh? (For purposed of this puzzle, assume the non-water part of the mixture is not affected by evaporation).
847. Make your way from HOME to WORK in only four steps, changing one letter at a time to make a good English word at each step.
HOME
______
______
______
WORK
848. The following 11 letters can be anagrammed to form a three-word phrase meaning "past one's prime."
TIELEHVHOLR
849. If Mary was five times as old as Mark 10 years ago and will be twice as old 20 years from now, how old are they now?
850. What is the next number in the sequence below?
1 4 9 7 7 9 4 1 ?
851. What common word contains the consonants l, k, n, w, and t and the vowels i and e?
852. Insert +, -, and/or parentheses between the digits to make 126. No operator between two digits forms a multi-digit number (for example 3 4 becomes 34).
1 2 3 4 5 6 = 126
853. Mr. Hobbs, the math teacher, has separated a list of numbers into two lists. Can you determine what criterion he used to separate the numbers?
1, 23, 57, 117, 12555, 222, 3
14, 263, 857, 1179, 1205, 888
854. What one three-letter word can be added to the blanks below to make a new word in each case?
BL________
D________Y
COMM____
BR______ED
W____ERED
ST_____ARD
855. Find the six-digit number in which the first and last digits are the same and each is three times the second and twice the third; the fourth digit is double the second; and the fifth is the sum of the second and third.
