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How many are in kindergarten?

There are 420 students in kindergarten through third grade. If 1/4 of the students are in first grade, 20% are in second grade, and 115 students in third grade, how many students are in kindergarten?
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1 Answer

420 total students
1/4 in 1st grade:  420(1/4) = 105
20% in 2nd grade: 420(.20) = 84
115 students in 3rd grade
 
# students in kindergarten = 420 - (105+84+115) = 116 students in kindergarten.