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What is the missing number?

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

Correct answers: 75

The first user who solved this task is Djordje Timotijevic.

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Demetri Martin: Cool Leather

I was at a party the other night, and I saw a guy wearing a leather jacket, and I thought, That is cool. Like 10 minutes later, I saw a guy wearing a leather vest and I thought, That is not cool. Thats when I realized cool is all about leather sleeves.

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John Ericsson

Died 8 Mar 1889 at age 85 (born 31 Jul 1803).Swedish-American inventor and naval engineer, who became an American citizen in 1847. He was the inventor of the screw propeller, built the first armoured turret warship, the USS Monitor. At the age of 14, he participated in the building of the Göta Canal (1817). A locomotive of his design, The Novelty, participated in a competition with Stephenson's Rocket in 1829. Ericsson invented and patented (No.588, on 1 Feb 1836) a double rotation propeller. In Aug 1861, the American Congress authorized ironclad warships and one ship of the Monitor type designed by Ericsson was ordered. By Mar 1862 the Monitor was ready for sea. He also developed a torpedo boat, The Destroyer, and worked to design his sun-motor engine.

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