Answer the A.P question
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a = 20
d = 58/3 - 20
=58-60/3
= - 2/3
300=n/2(2a+(n-1)d)
600=n(40+(n-1)(-2/3)
600=n(40-2/3n +2/3)
600=n(120-2n+2/3)
1800=n(122-2n)
Divide by 2 both sides
900=n(61-n)
n^2-61n+900=0
D=b^2-4ac
=3721-3600
=121
√D=11
n=61-11/2=50/2=25
n=61+11/2=72/2=36
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