XAT 2019 Question 56
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XAT
The stack of apples can be imagined as shown below. For every row, there is an increase of 1 apple from the previous row.
This means that the sum total of the apples present in the stack will be sum of AP given as : 1,2,3,4.... ie the sum of numbers from 1.
From the table we can see that when the customer saw 126 apples, the apples in the top 4 rows had been sold.
Therefore, the number of rows = 16 - 4 = 12 rows.