There are four three-digit n...
[4811] There are four three-digit n... - There are four three-digit numbers that share this property: the number itself, its double and its triple contain each digit from 1 to 9 exactly once. For example, 192 is one of them because 192, 384, 576 contain 1 to 9 each once. 273 is another one of them because 273, 546, 819 contain 1 to 9 each once. Can you find the other two numbers and calculate the product of these two numbers? - #brainteasers #math #riddles - Correct Answers: 23 - The first user who solved this task is Djordje Timotijevic
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There are four three-digit n...

There are four three-digit numbers that share this property: the number itself, its double and its triple contain each digit from 1 to 9 exactly once. For example, 192 is one of them because 192, 384, 576 contain 1 to 9 each once. 273 is another one of them because 273, 546, 819 contain 1 to 9 each once. Can you find the other two numbers and calculate the product of these two numbers?
Correct answers: 23
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
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Rotary washer

In 1858, a U.S. patent was issued for cycling reheated water in a washing machine, to Hamilton E. Smith of Philadelphia, Pennsylvania (No. 21,909). His invention was an improvement for washing machines in which a reciprocating plunger acts on clothes in a tub. His invention placed two horizontal diaphragms in the tub. Both moved vertically with the action of the plunger. The upper one was perforated, and the lower one had a valve. Below the lower diaphragm springs pushed it up as the plunger was lifted. Their motion acted to pump water into the tub from a circuit of pipe that included coils in a heating tank and drained cooler water from the top of the tub. Smith improved his machine and obtained a second patent in 1863.
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