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Answer:
Well honestly this is a easy one, to figure out the answer to this we first need to pay close attention, it says at the start 5/6 of it is filled which means 90% of it is filled, then it says 5 chalks were taken out by the teacher which would leave the box with 0, and lastly it says that 4 out of 5 of it was put back inside but it had 5 out of 6 but now 4 out of 5 which would mean that it would be 65.67% and then since that is not one of the options you would have to estimate and use number math to figure out what that could be and it would be 72, so 72% of it is filled, Hope this helps :D
Explanation: