Answer:To determine which person made a more concentrated salt solution, we need to compare the amount of salt dissolved in the given amounts of water for Marcia and Bobby.
Marcia dissolved 1.0 kilogram of salt in 3.0 liters of water.
Bobby dissolved 2.0 pounds of salt in 7.0 pints of water.
To compare these two solutions, we need to convert the units of measurement to either kilograms and liters or pounds and pints. Since we know that 1 L = 2.11 pints, let's convert Bobby's solution to kilograms and liters.
First, let's convert the 2.0 pounds of salt to kilograms. There are approximately 0.4536 kilograms in 1 pound. So, 2.0 pounds is equal to 0.9072 kilograms (2.0 pounds * 0.4536 kg/pound).
Next, let's convert the 7.0 pints of water to liters. Since 1 L = 2.11 pints, we can multiply 7.0 pints by 1 L / 2.11 pints to get the equivalent in liters. This gives us approximately 3.32 liters (7.0 pints * 1 L / 2.11 pints).
Now that we have both amounts in the same units, we can compare the concentration of the salt solutions.
Marcia dissolved 1.0 kilogram of salt in 3.0 liters of water, which gives us a concentration of approximately 0.33 kilograms of salt per liter (1.0 kg / 3.0 L).
Bobby dissolved 0.9072 kilograms of salt in 3.32 liters of water, which gives us a concentration of approximately 0.27 kilograms of salt per liter (0.9072 kg / 3.32 L).
Comparing the concentrations, we can see that Marcia's solution has a higher concentration of salt than Bobby's solution. Therefore, Marcia made a more concentrated salt solution.
Note: The concentrations have been rounded to the nearest hundredth for simplicity.
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