BRAIN TEASERS

enter your answer and press button OK

Find number abc

If b8719 + 713ab = 1c00c5 find number abc. Multiple solutions may exist.

Correct answers: 5

#brainteasers #math

Register with your Google Account and start collecting points.

Check your ranking on list.

Weekly coffee evolution

Monday, Tuesday, Wednesday, Thursday, Friday

Jokes of the day - Daily updated jokes. New jokes every day.

Follow Brain Teasers on social networks

Brain Teasers

puzzles, riddles, mathematical problems, mastermind, cinemania...

Index Visible

In 1912, Irving Fisher (1867-1947), a Yale professor, patented an archiving system with index cards. On 1 Jul 1925, Fisher's own firm, the Index Visible Company, merged with its principal competitor to form Kardex Rand Co., later Remington Rand, still later Sperry Rand. Fisher earned about $1 million for the invention, which grew to the princely sum of $9 million before being lost in the stock market crash of 1929. Fisher is widely regarded as the greatest economist America has produced, who made much use of mathematics in his work.

This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.