Can someone please help me understand ?
Mathematics

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First, let G represent Grade level and calculate G: G = 0.121 * (270/S) + 0.082 *8 + 0.659. Simplifying, we get
G = 8.47 / S + 0.656 + 0.659 = 8.47 / S + 1.315, so
G = 8.47 / S + 1.315. Now rewrite the equation so that S is by itself.
First, subtract 1.315 from both sides of the equation, gettinng G  1.315 = 8.47 /S.
Then, multiply both sides of the last equation by S, getting S(G  1.315) = 8.47.
To get S by itself, divide both sides of the last equation by (G  1.315) to get S = 8.47 / (G  1.315) which is valie provide G isn't equal to 1.315 (which it can't be since G can only be 1, 2 or 3).
Now consider the equation S = 8.47 / (G  1.315). If G were 1, then S would be negative, which makes no sense.
So, G could be 2 or 3. Try both.
S(2) = 8.47/(21.315) = 8.47 / (0.685)
S(3) = 8.47/(31.315) = 8.47 / (1.685)
which is bigger, S(2) or S(3)?
S(2) ~ 12.37 ~ 12
S(3) ~ 5.02 ~ 5
So, the maximum number of sentences would be 12 (for grade 2)
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