Calculate the number 175
[105] Calculate the number 175 - Calculate the number 175 using numbers [4, 4, 6, 5, 20, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math - Correct Answers: 64 - The first user who solved this task is Sanja Šabović
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Calculate the number 175

Calculate the number 175 using numbers [4, 4, 6, 5, 20, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 64
The first user who solved this task is Sanja Šabović.
#brainteasers #math
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Son of a lawyer

While two families were waiting in line to see the Washington Monument, their two 5-year-old boys were getting acquainted.

"My name is Joshua. What's yours?" asked the first boy.

"Adam," replied the second.

"My daddy is a doctor. What does YOUR daddy do for a living?" asked Joshua.

Adam proudly replied, "My daddy is a lawyer."

"Honest?" asked Joshua.

"No, just the regular kind," replied Adam.

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Steam percussion rock drill

In 1849, Joseph J. Couch received the first U.S. patent for a steam-powered percussion rock drill (No. 6,237) as “improved machinery for drilling rocks”. It was driven by steam power and acted without need of gravity supplying any part of the motion. A sliding drill support frame enabled it to be operated in any desirable position or direction. Power was supplied by the piston of a steam cylinder connected to a suitable steam generator. The machine would be held stationary as the rotating drill was thrown against the rock. The drill rod would disengaged at each stroke, and travel with its own momentum, so that upon striking the rock, the shock was not transmitted back to the rest of the machine, preventing it from damage. After each blow, the tool was seized by means of friction-grips to retract and repeat.«
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