general Maths Puzzle

When 3/4th of a unit's digit is added to the ten's digit of a two digit number, the sum of the digits becomes 10. If 1/4th of the ten's digit added to the unit digit, then the sum of the digits is 3 less than the sum of the original digits. What is the number ?

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general Other Question

The number of pairs of positive integers (a,b) where a and b are prime numbers
and a^2-2b^2=1 ,is
a)0 b)1 c)2 d)8
If a merchant purchases 25% more goods spending Rs 240 after the price of the goods fall by 20%. What are the old and new prices of the goods?