49,254 find value of 9

The highest point on earth is the peak of mount everest if you climb to the top you would be approximately 29,035 feet above sea level at remembering that amount is 5280 feet percentage of the height of the mountain would you have to climb to reach a point 2 miles above sea level

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Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers