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What is the missing number?

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

Correct answers: 61

The first user who solved this task is Djordje Timotijevic.

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Burglar's secret

A man walks into a police station and asks to speak to the burglar who broke into his house the night before.

"I’m sorry sir, but you'll get your chance in court,” says the duty officer.

“No, you don’t understand,” says the man. “I want to know how he got in the house without waking the wife. I've been trying to do that for years.”

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Dennis Robert Hoagland

Born 2 Apr 1884; died 5 Sep 1949 at age 65.American plant physiologist who was an authority on plant and soil interactions. He recognized early that the complex problems of soil and plant interrelations must be studied with rigid experimental control and the isolation of individual variables. Thus, he perfected the water-culture technique for growing plants without soil, which nutrient solution is still in plant physiology research. He collected much data on the influence of oxygen, temperature, light, and other factors on ion absorption by roots. In the late 1930's, he adopted radioactive isotopes as tracers. In his fieldwork on soil chemistry he studied zinc, potassium, and phosphate deficiencies of fruit trees in California. He influenced further intensive study of aspects of micronutrients (trace elements).

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