How old?
Number Theory
Level
2
By dividing the year my brother was born with my age at 2000, you'll have 79. How old is he today?
Assume my brother was born in the 1900s.
The answer is 41.
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1 solution
Let my age be 'x' years and the year in which my brother had born be 'y'.
Now according to question,
y = 79x
Now it can be noted that 79 * 25 is 1975 and 79 * 26 is 2054.
As the year can't be 2054,
We conclude that y must be 1975.
So the age of my brother will be 2016 - 1975 which is 41.
Hence, Present age of my brother is 41 years.