Find number abc
[5061] Find number abc - If aa455 - bacb5 = b9c40 find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 36 - The first user who solved this task is Djordje Timotijevic
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Find number abc

If aa455 - bacb5 = b9c40 find number abc. Multiple solutions may exist.
Correct answers: 36
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math
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Learning From Teachers

Eight-year-old Sally brought her report card home from school. Her marks were good...mostly A's and a couple of B's.
However, her teacher had written across the bottom: "Sally is a smart little girl, but she has one fault. She talks too much in school. I have an idea I am going to try, which I think may break her of the habit."
Sally's dad signed her report card, putting a note on the back: "Please let me know if your idea works on Sally because I would like to try it out on her mother."  

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Rock drill patent

In 1851, James W. Fowle was issued he first U.S. Patent for a direct-action percussion rock-drill (No. 7,972). He had filed a caveat in 1849, about two months after Joseph J. Couch received a patent for the first steam-powered percussion rock-drill. In Couch's design, the drill bar was not fastened to the piston head, but at each stroke was alternately caught, drawn back and thrown against the rock, like a lance. Both employed steam power. At first, Couch and Fowle had collaborated, but Fowle separated to pursue his own design, which is the real precursor of the drills developed in the following decades. To employ the direct action on the drill-bar Fowle had to solve the problem of how to avoid damage to the piston cylinder. He used compressed air to drive his“S” shaped drill.«
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