Question

A submarine situated at 800 feet below the sea level, descends 300 feet. What is it new position ?
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Answer 1

Here it is mentioned that the submarine is 800 feet below  the sea level

After that, it descends 300 feet.

This means that the submarine moves 300 feet below its initial position

We have to find its new position

New position = 800 + 300

                      = 1100

So, the new position of the submarine will be 1100 feet below sea level.