Here is a riddle in 2 languages, I received the Hindi one on WhatsApp so I translated it to English for those who don’t understand the Hindi Language.
There is a 4 digit car number,
4th digit is double of 1st digit,
2nd n 3rd digits are same,
And last digits together are double of first two digits
Can you guess the car number?
Hai koi genius ..jo sahi ans de sake…???
Ek car ka number 4 digits ka hai.
4th digit,1st digit ka double hai.
2nd n 3rd digits same hai.
Aur first two digits ka double last two digits hai.
Bolo car ka kya number Hai ?????
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Lets assume first digit is x, then the 4th digit will be 2x.
also assume 2nd and 3rd digits are y.
then from => last two digits are double of first two digits, we can say
y(2x) = 2*(xy)
We can rewrite is as 10y + 2x = 20x + 2 y
8y = 18x
4y = 9x; => y/x = 9/4
as x and y are integers y = 9, x = 4
Hence, The car number is 4998