Answer: 64
Explanation:
First you do, 237+192+179 which is 608.
Then you do, 800-608 which is 192.
Lastly, you do 192 divided by 3 which gives you 64 as your final answer. So you have to do 192/3 for the 3 7th grade classes to get an equal amount of the prize money.

Hope this helps!