What is the minimum possible number of students who could have joined the school in 2020?
Explanation:
To minimise the number of students who could have joined the school in 2021, we need to minimise the number of students that exit the school in 2021.
∴ We need to maximise the number of students failing in class 6.
If all 33 students in class 6 fail in 2020, these 33 students will remain in class 6 in 2021.
Hence, out of 48 students enrolled in class 6 in 2021, 33 of them were those who failed previous year and hence remained in class 6.
It means (48 - 33 =) 15 students of class 6 in 2021 were those who passed in class 5 in 2020.
Similarly, we can draw the following chart.
Hence, minimum number of students who could have joined the school in 2021 is 48.
Hence, 48.
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