Age Wise
In the year 2021, someone born in is old. What is ?
The answer is 11.
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1 solution
<19xy> + <yx> = 2021
2021 = [ 1900 + 10x + y ] + [ 10y + x ]
= 1900 + 10(x + y) + y + x
2021 - 1900 = 10 × (x + y) + 1 × (y + x)
121 = (10 + 1) × (x + y)
= 11(x + y)
x + y = 121 / 11 = 11