You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: christian 's father and the senior ranger gathered firewood as they walked towards the lake in the park and brought with them sacks . if every sack can contain around 20 pieces of wood how many sacks were they able to fill if they gathered 80 pieces of wood ?
[EX A]: 4

[EX Q]: a washing machine can wash 28 pounds of clothes per day . if there are 200 pounds of clothes to be washed per day how many washing machines are needed ?
[EX A]: 7.142857142857143

[EX Q]: there are 30 students in a class . if the teacher put them into groups with 5 students in each group how many groups would she have ?
[EX A]:
6