Given the task definition, example input & output, solve the new input case.
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.
Example: a paper bag can hold 16 cookies . if edgar buys 292 cookies how many paper bags does he need ?
Output: 18.25
number of paper bags = 292/16 = 18.25 bags

New input case for you: lex read a 420 page book about music and instruments . if he can read exactly 30 pages a day how many days will it take lex to finish reading the book ?
Output:
14