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Let’s analyze the problem step by step.

### Problem Description:
Two scientists, A and B, dissolved the same mass of salt but in different volumes of water. You are tasked with determining who created the more concentrated salt solution using a table of equivalent measures.

#### Data Given:
- Scientist A: 
  - Dissolved **1.0 kg of salt** in **3.0 liters** of water.
- Scientist B: 
  - Dissolved **1.0 pound of salt** in **7.0 pints** of water.

### Step 1: Convert Scientist B's measurements to metric units.

The provided conversion table gives:
- **1 kg = 2.20 lb**
- **1 liter = 2.11 pints**

#### Mass:
Scientist B used 1.0 pound of salt. To convert that into kilograms:
\[
\text{Mass in kg} = \frac{1.0 \, \text{lb}}{2.20} \approx 0.4545 \, \text{kg}
\]

#### Volume:
Scientist B used 7.0 pints of water. To convert that into liters:
\[
\text{Volume in liters} = \frac{7.0 \, \text{pints}}{2.11} \approx 3.318 \, \text{liters}
\]

### Step 2: Calculate Concentrations

Concentration is given by:
\[
\text{Concentration} = \frac{\text{Mass of Salt}}{\text{Volume of Water}}
\]

#### Scientist A:
\[
\text{Concentration}_A = \frac{1.0 \, \text{kg}}{3.0 \, \text{liters}} = 0.33 \, \text{kg/L}
\]

#### Scientist B:
\[
\text{Concentration}_B = \frac{0.4545 \, \text{kg}}{3.318 \, \text{liters}} \approx 0.137 \, \text{kg/L}
\]

### Step 3: Compare Concentrations
- Scientist A's concentration: **0.33 kg/L**
- Scientist B's concentration: **0.137 kg/L**

Since **0.33 kg/L > 0.137 kg/L**, **Scientist A** made the more concentrated salt solution.

### What went wrong in your answer:
In your response, you calculated Scientist A's concentration correctly (1 kg in 3 L gives 0.33 kg/L). However, for Scientist B, you incorrectly calculated the concentration by not converting the units or made a calculation error, which led you to conclude that Scientist B had a higher concentration.

Would you like more details on any of the steps?

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Here are 5 related questions:
1. How do you convert between metric and customary units accurately?
2. What is the relationship between concentration and volume?
3. How do we compare concentrations when different units are involved?
4. What happens to concentration if you increase the volume but keep the mass constant?
5. How do you ensure proper unit conversion in word problems?

**Tip:** Always convert all measurements to the same unit system before calculating or comparing.

Scientist A dissolved 1.0 kilogram of salt in 3.0 liters of water. Scientist B dissolved 1.0 pounds of salt in 7.0 pints of water. Which scientist made a more concentrated salt solution? Complete the explanation and give your answer.

This problem involves comparing the concentration of two salt solutions prepared by different scientists. Scientist A used 1.0 kilogram of salt in 3.0 liters of water, while Scientist B used 1.0 pound of salt in 7.0 pints of water. Learn how to calculate and compare concentrations by converting between metric and customary units, and understand which scientist made the more concentrated solution.

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