Today my age is equal to the last two digits of my year of birth." said a boy to his grandfather in 1942. To this, his grandfather, with a chuckle, said," it is true in my case also." The boy was trying to figure out how. Will you explain?
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To calculate the year of birth of the boy, we divide the last two digits of the year of birth (1942) by 2, that is 42/2 = 21. So he was born in 1921 and he was 21 years old in 1942. We have divided the number of years elapsed in that century by 2. If we take the previous century also into consideration, the number of years elapsed would be 142 which when divided by 2 gives 71. This number 71 must be the last two digits of the year of birth of grandfather. So he was born in 1871 AD and he was 71 years old in 1942 AD.
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