Five pupils

Five pupils clean 30 chairs one hour before four pupils. How many chairs clean one pupil in 1 hour?

Correct result:

n =  1.5


5n(t1)=30 4nt=30  5nt5n=30 4nt=30   5 30/45n=30  5 30/45 n=30  20n=30  n=32=1.5  t=30/(4 n)=30/(4 1.5)=5

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