Question:

“Intellectual endurance” is the staying power, the capacity to persist without getting distracted. At one point your brain ceases to cooperate, but please don’t stop doing this calculation. Take a few minutes rest and start again. This is one way of developing intellectual endurance. Take a ‘single digit number’ and a ‘three digit number’ of your choice… For example, suppose the numbers are: 8 and 156, write down on a paper as 8-156. Go on adding 13 to the first number and deduct 7 from the later. Do it simultaneously (Here is the example. your first number is 8 – 156. Hence your second number would be 21-149, third 34-142). At the end… what are your final figures when you reach the single digit answer on the right hand side? Don’t jump to calculate end figures, do it step by step to test your patience.

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Answer: The end figure is 294-2. Even if you could not calculate correctly, don’t worry. You have the capacity to work till the end, and that is ‘patience’.