A submarine hovers at 66 and 2 thirds yards below sea level. If it ascends 24 and 1 eighth yards and then descends 78 and 3 fourths yards, what is the submarine’s new position, in yards, with respect to sea level?

Below sea level is represented by a negative number, so the submarine starts at −66 2/3 yards. Ascending adds 24 1/8 yards, while descending subtracts 78 3/4 yards: −66 2/3 + 24 1/8 − 78 3/4 = −121 7/24. The new position is negative 121 and 7/24 yards, which is choice C.

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