Quantitative Aptitude - Arithmetic Ability Questions

If √(1 - cos2A)/cosA = x, then the value of x is

If 7x - [3(2x - 3)]/2 = 1/2, then what is the value of x?

Ramu can row 9 kmph in still water. It takes him twice as long to row up as to row down. Find the rate of stream.

Two whole numbers are such that the square of first number exceeds the second by 112 and the ratio of the numbers is 4:3. What is thevalue of smaller number?

If a+bab=21 ,  then the value of (a-b) is

At 10% discount the selling price of an article is Rs 4500, what is the selling price (in Rs) if the discount is 27.5%?

The average of 10 numbers is X and one of the number is 38. If 38 is replaced with 19, then what will be the new average?

The ratio of sand to gravel in a mixture is 17:8 while that between gravel and cement is 6:17. What is the ratio of sand to cement in the mixture?