A Drive In Theater Has Spaces For 20 Cars In The First Parking Row 22 In The Second 24 In The Third And So On If There Are 21 Rows In The Theater Find

a drive in theater has spaces for 20 cars in the first parking row 22 in the second 24 in the third and so on if there are 21 rows in the theater find the number of cars that can be parked? WITH SOLUTION

 

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Answers

PrimAndProper

PrimAndProper Senior

a₁ = 20

d = 22-20 = 24-22

d = 2 = 2

d = 2

n = 21 (rows)

Sn = n/2 2(a₁) + (n-1)(d)

S₂₁ = 21/2 2(20) + (21-1)(2)

S₂₁ = 21/2 40 + 40

S₂₁ = 21/2 (80)

S₂₁ = 21 (40)

S₂₁ = 840 cars