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

Tori is a school janitor . Last week , she picked up a total of 1576 pieces of trash . If she picked up 344 pieces of trash in the classrooms , how many pieces of trash did Tori pick up outside the classrooms ?
1232

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

Mary found 2 seashells and Keith found 5 seashells on the beach . When they cleaned them , they discovered that 9 were cracked . How many seashells did they find together ?

7