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 left. How many is the average count of pupils in one class if there are always four classes each grade?

Correct answer:

n =  35

Step-by-step explanation:

LCM(4,5,6,7)=22357=420  n=LCM(4,5,6,7)/(3 4)=35

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