70% of the 100 students in a middle school cafiteria bought their lunch. Some of the students that bought their lunch leave the cafiteria to attend an assembly. Now only 60% of the remaining students bought their lunch. How many students are remaining in the cafiteria? Explain.
The answer is 75, how do I do this problem?
The answer is 75, how do I do this problem?
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70% of 100
That's 70. This means that 70 students of the 100 students bought their lunch.
60% of the remaining students that brought their lunch
This means 60% of the 70 students.
60% of 70 = 42
It's not 75.
That's 70. This means that 70 students of the 100 students bought their lunch.
60% of the remaining students that brought their lunch
This means 60% of the 70 students.
60% of 70 = 42
It's not 75.