101 Amazing Brainteasers by Jack Goldstein

Author:Jack Goldstein
Language: eng
Format: epub
Tags: quiz, puzzle, riddle, IQ, brain, learn, fun, intelligent, what am i, MENSA, smart, words, numbers, logic, education, class, lateral
ISBN: 9781782348924
Publisher: Andrews UK
Published: 2013-05-01T00:00:00+00:00

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Numbers

Here are some math (or maths if you are English) based brainteasers.

Why are these numbers in the order that they are in? 8, 5, 4, 9, 1, 7, 6, 10, 3, 2, 0

A scientist is experimenting with bacteria that are one micron in diameter and that reproduce by dividing every minute into two bacteria. At 12:00pm, she puts a single organism of this bacteria into a container. At precisely 1:00pm, the container is full. At what time was the container half full?

How can you make eight 8s add up to 1000?

There is a three digit number. The second digit is four times as big as the third digit, and the first digit is three less than the second digit. What is the number?

Name the last year we have had which reads the same upside down.

And the next one?

An old-fashioned bike wheel has 23 spokes. How many spaces are there between the spokes?

What is greater: half of a quarter or quarter of a half?

Two men play seven complete games of chess. Each man wins the same number of games and there are no ties. How?

A farmer has seventeen sheep. All but nine of them die. How many sheep does he have left?

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