This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
21.6 days
Here are the solutions to the problems.
: The problem describes an inverse proportion between the number of men and the number of days the food lasts (or a job takes). The table provides the specific values.
Step 1: Identify the given values and the relationship. Initially, there are men, and the job takes days. For the new scenario, there are men, and we need to find the number of days, let's call it . Since the total amount of work (or food supply) is constant, the product of men and days remains the same.
Step 2: Set up the inverse proportion equation.
Step 3: Solve for . The job would take days for men.
The job would take .
: This problem describes a direct proportion between the mass of beef and its cost.
Step 1: Identify the given values and the relationship. kg of beef costs . We need to find the cost of kg of beef. The cost per kilogram is constant.
Step 2: Calculate the cost per kilogram.
Step 3: Calculate the cost of kg of beef.
The cost of kg of beef is .
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The problem describes an inverse proportion between the number of men and the number of days the food lasts (or a job takes).
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.