Mathematics, 11.06.2020 18:57 toriflaherty

During this year, the first cellular phone was introduced to the market. It cost $3,500 and weighed an enormous 16 oz. (Cell phones today weigh less than 5 oz.) The sum of the digits in the thousands place and the ones place is half of the digit in the tens place. The digit in the thousands place is neither prime nor composite. The digit in the hundreds place is the sum of the digits in the thousands and the tens place. The digit in the hundreds place is 3 times the digit in the ones place. What year am I?

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During this year, the first cellular phone was introduced to the market. It cost $3,500 and weighed...