The decimal number system uses the characters 0,1,2,...,8,9 and the octal number system uses the characters 0,1,2,...,6,7. For example, the decimal number 12 (=...

A shopkeeper buys shirts from the producer at Rs. 2,500.00 per shirt and sells them at 20% profit. A customer has to pay Rs. 3,186.00 including 18% taxes, per s...

If, for non-zero real variables x, y, and real parameter a>1, x:y=(a+1):(a-1), then the ratio (x2-y2):(x2+y2) is _______.