Calculate the number 4040
[6990] Calculate the number 4040 - NUMBERMANIA: Calculate the number 4040 using numbers [3, 1, 7, 9, 15, 390] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 9 - The first user who solved this task is Nasrin 24 T
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Calculate the number 4040

NUMBERMANIA: Calculate the number 4040 using numbers [3, 1, 7, 9, 15, 390] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 9
The first user who solved this task is Nasrin 24 T.
#brainteasers #math #numbermania
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Final Exam

A college teacher reminds her class of tomorrow's final exam. 'Now class, I won't tolerate any excuses for you not being here tomorrow. I might consider a nuclear attack or a serious personal injury, illness, or a death in your immediate family, but that's it, no other excuses whatsoever!' 

A smart-ass student in the back of the room raised his hand and asked, 'What would you say if tomorrow I said I was suffering from complete and utter sexual exhaustion?'
The entire class is reduced to laughter and snickering. When silence was restored, the teacher smiled knowingly at the student, shook her head and sweetly said, 'Well, I guess you'd have to write the exam with your other hand.'

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In 1955, the first U.S. house to be both solar-heated and radiation-cooled started its system. It was built in Tucson, Arizona by solar physicist Raymond W. Bliss, Jr. (6 Oct 1915 - 7 Nov 2004). The system was built at a cost of nearly $4,000 for labour and materials. It was made using a large slanted slab of steel and glass that converted sunlight into heat, which was ducted into the house. Summer cooling used the same ducts and associated fans and controls. The first U.S. house to be completely solar heated was occupied in Dover, Mass. on 24 Dec 1948. That heating system was designed by Dr. Maria Telkes from the MIT Solar Laboratory, used black sheet metal collectors to capture solar energy, stored by the phase-change of sodium sulphate decahydrate in “heat bins.”
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