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Sami Rizk

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347. kalic CZ 3
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349. Sami Rizk 3
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last 3 solved tasks
What number goes into the empty square?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

John Harrison

Died 24 Mar 1776 at age 83 (born 24 Mar 1693).English horologist who invented the first practical marine chronometer, which enabled navigators to compute accurately their longitude at sea. He was prompted to begin this work after a huge reward was offered by the British government for new navigational tools to avoid further disasters at sea. John Harrison took on the scientific and academic establishment of his time and won the longitude prize through extraordinary mechanical insight, talent and determination.[DSB shows an uncertainty in the date of birth as 24 Mar(?) 1693. EB gives no specific day, just Mar 1693.]

Future value

A tourist, driving by a Texas ranch, hit and killed a calf that was crossing the road. The driver went to the owner of the calf and explained what had happened. He then asked what the animal was worth.

"Oh, about $200 today," said the rancher. "But in six years, it would have been worth $900. So $900 is what I'm out."

The tourist sat down and wrote out a check and handed it to the farmer.

"Here, is the check for $900," he said. "It's postdated six years from now."

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