What is the number of 360-degree rotations that Tashi’s unicycle wheel

OFFICIAL SOLUTION:

To determine the number of 360-degree rotations (once around) that Tashi’s wheel turned in the 50 meters, you have to know the circumference of the circle in meters. Then you can divide 50 by the circumference to arrive at your answer. To determine the circumference, you need to know the radius, because C = 2πr.

The diameter is double the radius, so statement (1) gives you enough information to determine the radius and solve the problem. The first statement is sufficient, so the answer is either A or D.

The initial question provides no information on total time, so the number of rotations per minute doesn’t help solve the problem. Statement (2) is insufficient, so the answer can’t be D.

Choose A.