Four classses

Students of all 7, 8, and 9 classes in one school may take up 4, 5, 6, and 7 abreast, and nobody will be left. If there are always four classes in each grade, what is the average number of pupils in one class?

Correct answer:

n =  35

Step-by-step explanation:

4=22 5 ...  prime number 6=23 7 ...  prime number LCM(4,5,6,7)=22357=420  a=LCM(4,5,6,7)=420  n=3 4a=3 4420=35



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