100= 300 (a+1)/24

please note that I can re-write yourequation as below:

100=25*[(a+1)]/2

so multiplying both sides by 2, I get:

200=25*(a+1)

then dividing both sides by 25, I can write:

8=a+1

finally subtracting 1, from both sides, we have:

a=7

that is your answer

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