Mrs. Rushing has 3 chemistry classes with 24 students in each. An experiment calls for each student to use 4 test tubes. How many test tubes are needed in all for her classes?

First find the total number of students: 3 classes × 24 students = 72 students. Each student needs 4 test tubes, so 72 × 4 = 288 test tubes. The correct choice is 288 test tubes.

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