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• Measurement and Matter
Setting up the math for a one-step quantitative problem
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The average adult heart pumps about 84. mL/s of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 1300. mL of blood.

To solve this problem, we need to set up a one-step quantitative equation. We know the following information:

- The average adult heart pumps **84 mL of blood per second**.
- We need to find out **how long** it will take to pump **1300 mL of blood**.

### Step-by-step process:

1. **Set up the equation:**

   We know that:
   \[
   \text{Rate of blood pumped} = \frac{\text{Volume of blood}}{\text{Time taken}} 
   \]
   Rearranging to solve for time, we have:
   \[
   \text{Time taken} = \frac{\text{Volume of blood}}{\text{Rate of blood pumped}}
   \]

2. **Plug in the values:**

   - Volume of blood = 1300 mL
   - Rate of blood pumped = 84 mL/s

   So,
   \[
   \text{Time taken} = \frac{1300 \, \text{mL}}{84 \, \text{mL/s}} = \frac{1300}{84} \approx 15.48 \, \text{seconds}
   \]

Thus, it would take approximately **15.48 seconds** for the average heart to circulate 1300 mL of blood.

Would you like more details or have any questions?

### Related Questions:
1. How many liters of blood does the heart pump in a minute?
2. If the rate of blood pumping increases, how does it affect circulation time for a fixed volume?
3. How would the time change if the heart pumped 100 mL/s of blood?
4. Can the rate of blood pumping vary between individuals, and how would that impact this calculation?
5. How does the rate of blood pumping correlate with heartbeats per minute?

### Tip:
Always ensure your units are consistent when performing calculations, especially in rate problems (mL, seconds, beats per minute, etc.).

The average adult heart pumps about 84. mL/s of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 1300. mL of blood.

Learn how to calculate the time it takes for the average heart to circulate 1300 mL of blood using the unit rate of 84 mL per second. This problem involves setting up a one-step equation and is suitable for students in Grades 6-8.

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