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Find number abc

If a81b7 + 12a74 = 8c831 find number abc. Multiple solutions may exist.

Correct answers: 44

The first user who solved this task is Djordje Timotijevic.

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Good news...bad news...

"I have good news and bad news," a defense attorney told his client.

"First the bad news: The blood test came back, and your DNA is an exact match with the sample found on the victim's dress."

"Oh, no - I'm ruined!" cried the client. "What's the good news?"

"Your cholesterol is down to 140!"

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Safety lamp

In 1816, Sir Humphry Davy's safety lamp was first used in a coal mine. Deadly explosions had been a continual hazard caused by the flammable gas, methane, leaking out of the coal seams ignited by the flame of a miner's lamp. There had been previous attempts by others to make a safety lantern. Davy applied a scientific approach to determine the suitable fineness of wire gauze placed around the flame which would avoid ignition of flammable gas outside. He determined that the holes in the gauze should be less than 1/22 inch in diameter, and that the wire itself should be between 1/40 to 1/60 inch thick. Since the flame changed colour in the presence of methane, it also served as a warning to the miner to take protective action.«[Image: Davy safety lamp, circa 1816.]

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