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Calculate the number 877

NUMBERMANIA: Calculate the number 877 using numbers [7, 1, 2, 1, 15, 866] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 17

The first user who solved this task is Nílton Corrêa de Sousa.

#brainteasers #math #numbermania

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Operation Clean-Up

Yesterday my husband thought he saw a cockroach in the kitchen. He sprayed everything down and cleaned thoroughly.
Today I’m putting a cockroach in the bathroom.

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Zabdiel Boylston

Born 9 Mar 1676; died 1 Mar 1766 at age 89.American physician who introduced smallpox inoculation into the American colonies. Small-pox had broken out again in Boston in 1721. Rev. Cotton Mather had learned of a technique being practiced abroad that was reported to give protection. When a small wound was infected with pus taken from a smallpox sore, a person would thereupon develop a trivial case of the disease, but would likely suffer no further more serious infection later. After Mather was rebuffed by other medical practitioners in Boston, he approached Boylston with the idea to experiment with the technique. Boyston thought a trial to be so worthwhile that he inoculated his own son and two others on 26 Jun 1721. Their resulting illness was mild; they recovered by 4 Jul 1721.

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