Report card

Ivor hit 4× grade 5 at the beginning of the school year. How many times must you 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=0.514=28  x=28  (5 4+1 y)=2.5 (4+y)  1.5y=10  y=1.510=6.66666667  y=3206.666667  y < N  < x  N=1.52.5 4=7



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