What is happening
You arrive at a classroom tidy-up race with paperclips spilled across the floor.
The clips have to be off the floor before the bell. Each magnet picks up 3 paperclips in one sweep, and 12 clips are down there.
How many magnetsRunning
Clips lifted
27clips
Clips on the floor
12clips
Clips lifted is over by 15 clips
Field coil. Magnets used at 9 magnets. Clips lifted 27 clips, Clips on the floor 12 clips. Currently clips lifted is over by 15 clips.
What has to balance