Rohini’s resting heart rate is 78 beats per minute. How many heartbeats will her heart make in 9 minutes?
Answer
702 beats
The correct answer is 702 beats — State the total number of heartbeats in 9 minutes as 702 beats.
Step-by-step solution
- Identify the given heart rate: 78 beats per minute.
- Identify the time interval: 9 minutes.
- Multiply the heart rate by the time interval: 78 9 = 702.
- State the total number of heartbeats in 9 minutes as 702 beats.
Common mistake: Multiplying the time in minutes by 60 instead of using the given beats‑per‑minute rate.
Concept tested: Heart rate calculation
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