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Calculate the number 4101

NUMBERMANIA: Calculate the number 4101 using numbers [4, 4, 5, 6, 39, 972] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 28

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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Unvaccinated baby

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Lawn mower

In 1830, English mechanic Edwin Beard Budding (c.1796 - 1846), inventor of the lawn mover, signed a manufacturing agreement with John Ferrabee, Phoenix Iron Works, Stroud. Budding based his design on the helical cutting blades he had seen on cylinders run over newly woven cloth to cut the pile for a smooth finish. His patent (No. 5,990, 31 Aug 1830) described his mower to replace hand scythes for "cropping or shearing the vegetable surface of lawns, grass plats, and pleasure grounds." It had a cast iron frame with a large roller that turned a series of cogs which rotated the blades. Production was increased in 1832 by license to the agricultural manufacturer Ransomes. Budding also invented the adjustable spanner.«

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