Quantitative Aptitude - Arithmetic Ability Questions

What is the value of √[(1 ­- cosA)/(1 + cosA)]?

46% of 250 is equal to

The value of x for which the expressions 5x + 17 and 17x - 5 become equal is _____.

If xy+yz+zx = 1, then the value of (1+y2)(x+y)(y+z) ?

What will be the roots of the quadratic equation x2 - 25x + 156 = 0?

A businessman imported Laptops, worth Rs 210000, Mobile phones worth Rs 100000 and Television sets worth Rs 150000. He had to pay 10% duty on laptops, 8% on Phones and 5% on Television sets as a special case. How much total duty (in Rupees) he had to pay on all items as per above details?

If 7/8th of 5/4th of a number is 315, then 5/9th of that number is _____

If the value of √42 is approximately 6.480, then what is the approximate value of √(6/7)?