BRAIN TEASERS

# Calculate the number 4109

NUMBERMANIA: Calculate the number 4109 using numbers [4, 6, 1, 5, 80, 743] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Manguexa Wagle.
#brainteasers #math #numbermania

### The Chinese Doctor & The Lawyer

A Chinese Doctor can't find a job in a Hospital in the US, so he opens his own clinic and puts a sign outside
'GET TREATMENT FOR \$20 - IF NOT CURED GET BACK \$100.'
An American lawyer thinks this is a great opportunity to earn \$100 and goes to the clinic.
Lawyer: 'I have lost my sense of taste.'
Chinese: 'Nurse, bring medicine from box No. 22 and put 3 drops in patient's mouth.'
Lawyer: 'Ugh. this is kerosene.'
Chinese: 'Congrats, your sense of taste is restored. Give me \$20.'
The annoyed lawyer goes back after a few days to recover his money.
Lawyer: 'I have lost my memory. I cannot remember anything.'
Chinese: 'Nurse, bring medicine from box no. 22 and put 3 drops in his mouth.'
Lawyer (annoyed): 'This is kerosene. You gave this to me last time for restoring my taste.'
Chinese: 'Congrats. You got your memory back. Give me \$20.'
The fuming lawyer pays him, and then comes back a week later determined to get back \$100.
Lawyer: 'My eyesight has become very weak I can't see at all.'
Chinese: 'Well, I don't have any medicine for that, so take this \$100.'
Lawyer (staring at the note): 'But this is \$20, not \$100!!'
Chinese: 'Congrats, your eyesight is restored. Give me \$20'

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### Maser

In 1959, the maser was patented by Charles Townes (No. 2,879,439). "Maser" is an acronym for "Microwave Amplification by the Stimulated Emission of Radiation ". The invention is an apparatus for amplifying and producing electromagnetic energy directly from excited molecules or atoms. The concept grew out of research in microwave spectroscopy following Word War II . The image shows Townes with the second maser at Columbia University. The normally evaculated metal box where maser action occurs is opened up to show the four rods (centre) that send excited molecules into a resonant cavity (to the right). The microwaves that were generated emerged through the vertical copper waveguide near Townes' hand.
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