Question

A climber starts descending from 553 feet above sea level and keeps going until she reaches 10 feet below sea level. How many feet did she descend?

Answer 1

The climber descended 543 feet. She starts descending from 553 feet, and keeps descending until she reaches 10 feet. 553-10=543. To check the answer, add 10 to 543, which gets you 553.