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A colony's coin-operated drinking water point keeps two records that sit uneasily together: the number of cans filled at the point has risen month by month for a year, while the money taken from its coin box each month has fallen over the same year. Which of the following, if true, does most to account for both records?

Competition practiceLogical / Critical
  • AThe point is fed from the same borewell that supplies the colony's household taps
  • BPart way through the year the panchayat began issuing prepaid cards for the point to households on its welfare list, and the money paid for those cards is collected at the panchayat office and never reaches the coin box
  • CThe cans used at the point hold twenty litres each
  • DThe point was shut for repairs for four days in the course of the year

Step-by-Step Solution

The two records will only be reconciled by something that lets water be drawn without a coin being dropped. A prepaid card does exactly that: more cans are filled, and a growing part of the payment for them is banked elsewhere, so the coin box empties as the point grows busier. The source of the water and the size of a can are constants that cannot produce a change in either record, and four days' closure would pull both records down together, not push them apart.
Answer: B) Part way through the year the panchayat began issuing prepaid cards for the point to households on its welfare list, and the money paid for those cards is collected at the panchayat office and never reaches the coin box

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