Note: you will just analyzed or understand the given problem and then after that you will add all of the students who spent their hours doing their assignments (⑅•ᴗ•⑅)
Hope it helps ( ˶ ᵕ ˶)
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1. 30 pupils/students
2. more than 2h and 30min
3. 2 pupils/students
4. 78 pupils/students
Note: you will just analyzed or understand the given problem and then after that you will add all of the students who spent their hours doing their assignments (⑅•ᴗ•⑅)
Hope it helps ( ˶ ᵕ ˶)