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In the following circles, th...

In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?

Correct answers: 108

The first user who solved this task is Jakubovski Vladimir.

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Hedonism among tropical fruits

There's a lot of hedonism among tropical fruits. It's always “Go, mango, guava good time!” But the next day they papaya the piper.

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Florence Seibert

Died 23 Aug 1991 at age 93 (born 6 Oct 1897).American scientist who developed the protein substance used for the tuberculosis skin test, and contributed to safety measures for intravenous drug therapy. In the early 1920s, she discovered that the sudden fevers that sometimes occurred during intravenous injections were caused by bacteria in the distilled water used to make the protein solutions. She invented a distillation apparatus designed to prevent such contamination. In 1941, her improved TB skin test became the standard test in the U.S. and a year later was adopted by the World Health Organization. It is still in use today. Her later research involved the study of bacteria associated with certain cancers.

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