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Calculate the number 9809

NUMBERMANIA: Calculate the number 9809 using numbers [7, 6, 2, 6, 21, 745] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 29

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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At The Public Pool

The lifeguard told the mother to make her young son stop urinating in the pool.
"Everyone knows," the mother lectured him, "that from time to time, young children will urinate in a pool."
"Oh really?" said the lifeguard, "from the diving board!?!?"

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Tidal power

In 1966, President Charles de Gaulle opened the world's first tidal power station at Rance estuary, in Brittany. La Rance is the most powerful tidal power plant in the world. With its width of 700 metres, it blocks La Rance estuary situated near Saint-Malo (Côtes d'Armor). The operation of the dam is similar to that of run-of-river power plants since its head is also low and there is a substantial flow rate. At high and low tide, the water builds up rapidly on one of the sides of the dam. When the difference in level is sufficient, the gates are opened and the water rushes into the dam. The turbines are reversible so as to be able to operate regardless of the direction of water flow. Each year, the power plant generates 500 million kWh.

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