To find out how many buses you need for 400 people, when each bus holds 60 people, you can use the following calculation:
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Divide the total number of people by the capacity of each bus: \[ \frac{400}{60} \approx 6.67 \]
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Since you can't have a fraction of a bus, you need to round up to the next whole number. This means you will need 7 buses.
So, you need 7 buses to transport 400 people.