To find the cost per serving, we can calculate the cost for each of the given serving sizes.
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For 3 servings costing $18: \[ \text{Cost per serving} = \frac{18}{3} = 6 \] So, the cost per serving for 3 servings is $6.
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For 10 servings costing $60: \[ \text{Cost per serving} = \frac{60}{10} = 6 \] So, the cost per serving for 10 servings is also $6.
In both cases, the cost per serving is $6.