Answer:
The correct option would be D. 60%
Explanation:
This is because if only 40% percent of the students are measuring the chemicals then, out of 100%, 60% of students are not measuring chemicals.
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60%
Step-by-step explanation: THeres 30 students, 40% are measuring so that leaves 60% not measuring because in order to have 100% students you'll need 60 to add to the current 40% of students already doing the measuring.
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