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Replace the question mark with a number

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

Correct answers: 415

The first user who solved this task is Sanja Šabović.

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Two women are walking down the street when a mugger approaches them and demands their money.

They both grudgingly pull out their wallets and begin taking out their cash.

Just then, the woman turns to the other and hands her a bill.

"Here’s that $20 I owe you," she says.

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Stillson wrench

In 1876, a U.S. patent for the first practical pipe wrench - the Stillson wrench - was issued to Daniel C. Stillson of Somerville, Mass. (No. 184,993). In 1869, he had whittled a model out of wood, which he showed to his boss at the Walworth Company. He recognised the wooden pattern showed a new type of pipe wrench, superior to anything else in use at that time, and badly needed in the growing pipe industry. Stillson was instructed to test one built in steel. The test convinced the company owner that the concept was sound. Stillson obtained a patent, and offered to sell the patent for a small outright payment. Instead, the owner graciously advised Stillson accept royalties instead. Stillson thus earned far more in his lifetime.*

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