Report card

Ivor hit 4× grade 5 at the beginning of the school year. How many times must now catch grade 1 to get grade 2 on the report card?

Correct answer:

N =  7

Step-by-step explanation:

2=[(5 4+1 N)/(4+N)] 1.5<=(5 4+1 N)/(4+N)<2.5 1.5(4+N)<=(5 4+1 N)<2.5 (4+N)  1.5(4+x)=(5 4+1 x)  1.5 (4+x)=(5 4+1 x)  0.5x=14  x=28  (5 4+1 y)=2.5 (4+y)  1.5y=10  y=2036.666667  y<N<x  N=2.5 41.5=7

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