These complicated elevator rules are just begging for a puzzle: There are 153 people, 45 electric wheelchairs, and 37 manual wheelchairs waiting to get onto the elevator. Find the minimum number of  elevator trips necessary to take everything.

These complicated elevator rules are just begging for a puzzle:

There are 153 people, 45 electric wheelchairs, and 37 manual wheelchairs waiting to get onto the elevator. Find the minimum number of  elevator trips necessary to take everything.

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