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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 375

The first user who solved this task is Donya Sayah30.

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The Truth About Cats and Dogs

A dog thinks: Hey, these people I live with feed me, love me, provide me with a nice warm, dry house, pet me, and take good care of me... They must be Gods!

A cat thinks: Hey, these people I live with feed me, love me, provide me with a nice warm, dry house, pet me, and take good care of me... I must be a God!

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Hay fever

In 1819, the first clinical description of an allergy was delivered by Dr John Bostock to the Royal Medical and Chirurgical Society meeting in London. Bostock's paper, published in the society's Transactions, was titled “A Case of the Periodical Affectation of the Eyes and Chest.” It was, in reality, a description of his personal sufferings (During hay season, lay-persons called it hay fever.) In 1828, he gave a longer, more detailed paper, describing 28 more case, titled “OnCatarrhus Æstivus or Summer Catarrh.”For many years doctors called it “Bostock's catarrh.” Pollens of grasses, weeds and trees (also mold spores) are the main causes of this type of allergy.The nose lining swells, with a runny discharge. Also spells of sneezing and itchiness of the throat and palate also occur. The eyes may be similarly affected.«[Ref: Medico-Chirurgical Transactions (1819), 10:1, 161-165, and (1828), 12, 437-447.]

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