BRAIN TEASERS

enter your answer and press button OK

Calculate the number 787

NUMBERMANIA: Calculate the number 787 using numbers [4, 7, 4, 7, 10, 764] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 3

#brainteasers #math #numbermania

Register with your Google Account and start collecting points.

Check your ranking on list.

Jon Dore: Ability to Hide

My grandfather avoided the Holocaust with his ability to hide, and by not being Jewish, and by living in Canada his entire life -- all about strategy.

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...

Vladimir Nikolayevich Ipatieff

Died 29 Nov 1952 at age 85 (born 21 Nov 1867).Russian-American chemist who was one of the first to investigate high-pressure catalytic reactions of hydrocarbons and who developed a process for manufacturing high-octane gasoline. While studying in Munich (1897) Ipatieff achieved the synthesis of isoprene, the basic unit of the rubber molecule. Upon return to Russia he worked particularly on the use of high-pressure catalysis and of metallic oxides as catalysts. With these techniques, he helped to establish the petrochemical industry in both pre- and post-revolutionary Russia. Before WW I, he had synthesized isooctane, and had polymerized ethylene. After moving to the U.S. (1930), Ipatieff showed how to convert low-octane gasolines into high-octane by 'cracking' hydrocarbons at high temperatures.

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.