To determine how many calls each volunteer has to make, you can follow these steps:
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First, find the total number of volunteers: \[ 4 \text{ groups} \times 7 \text{ volunteers/group} = 28 \text{ volunteers} \]
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Next, divide the total number of calls (280) by the total number of volunteers (28): \[ \frac{280 \text{ calls}}{28 \text{ volunteers}} = 10 \text{ calls/volunteer} \]
So, each volunteer has to make 10 calls to reach the goal.