Quantitative Aptitude - Arithmetic Ability Questions

Calculate the value of 61681 x 61681 - 31681 x 3168130000?

If 4x - 7y = 3 and 2x - y = 9, then x - y is.

If x + y = 10 and xy = 4, then what is the value of x4 + y4?

Two numbers are 50% and 80% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

If ab-1b=cb-1c=ac-1a, then ac+ba+cb

If the number 583_437 is completely divisible by 9, then the smallest whole number in the place of the blank digit will be

Two numbers are 40% and 80% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

A vendor buys bananas at 4 for Rs 3 and sells at 3 for Rs 4. What will be the result?