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In a warehouse (384) sacks are placed on (8) racks. If the first rack has (20) sacks and each next rack has an equal increase then what is the increase?

Answer and explanation

Correct answer: (8)

The direct answer is option C, an increase of 8 sacks per rack. The rack counts form an arithmetic progression with first term \(a=20\), number of terms \(n=8\), total \(S_8=384\), and common difference \(d\). Use \(S_n=\frac n2[2a+(n-1)d]\). Thus \(384=\frac82[40+7d]=4(40+7d)\). Dividing by 4 gives \(96=40+7d\), so \(7d=56\) and \(d=8\). Option A, 6, would give a total of 352, not 384. Option B, 7, would give 380. Option C, 8, gives the stated total and is correct. Option D, 9, would give 408. The important step is to use the total sum, not only the last rack.

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