Discussion

In a camp, there is a meal for 120 men or 200 children. If 150 children have taken the meal, how many men will be created to with the remaining meal?

Answer: B

The meal is one fixed quantity, described two ways, so the two descriptions are equivalent:

\[ 120 \text{ men} \equiv 200 \text{ children} \]

After 150 children have eaten, what is left would feed \( 200 - 150 = 50 \) children. Converting that share to men:

\[ 50 \text{ children} \times \frac{120 \text{ men}}{200 \text{ children}} = 30 \text{ men} \]

The step that matters is doing the subtraction in children and converting only at the end; converting first and then subtracting mixes the two units.

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