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.

Karin 's science class weighed plastic rings for an experiment . They found that the orange ring weighed 0.08333333333333333 ounce , the purple ring weighed 0.3333333333333333 ounce , and the white ring weighed 0.4166666666666667 ounce . What was the total weight of the plastic rings ?
0.8333333333333334

Tom was putting his spare change into piles . He had 2 piles of quarters and 4 piles of dimes . If each pile had 5 coins in it , how many coins did he have total ?
30

A worksheet had 7 problems on it . If a teacher had 17 worksheets to grade and had already graded 8 of them , how many more problems does she have to grade ?

63