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If a girl jumps 820 times in 1 hour, how many times will she jump in 30 minutes _____________?

A) 205
B) 350
C) 410
D) 820

Correct Answer: C) 410

Reason: First, calculate the jumping rate per minute: 820 jumps / 60 minutes = 13.67 jumps/minute. Then, multiply the rate by 30 minutes: 13.67 jumps/minute * 30 minutes ≈ 410 jumps. Alternatively, since 30 minutes is exactly half of 1 hour, she will jump 820 / 2 = 410 times. Related MCQs: This is a **Rate and Proportion** problem. | If the time was 15 minutes, the answer would be 820 / 4 = 205. | If the rate changes, the direct proportion calculation is inaccurate. | Rate is constant: **rate = distance / time**.

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