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.

Grace has 16 jellybeans in her pocket . She has 8 red ones , 4 green ones , and 4 blue ones . What is the minimum number of jellybeans she must take out of her pocket to ensure that she has one of each color ?
13

If a pair of shoes that cost 50 dollars was marked down by 8 % , how much do they cost now ?
46

A teacher had 6 worksheets to grade . If she graded 4 , but then another 18 were turned in , how many worksheets would she have to grade ?

20