Quantitative Aptitude - Arithmetic Ability Questions

If cos 27° = x, the value of tan 63° is

The average marks obtained by Raghav in 12 tests is 24. Zubeida has maintained an average of 23 so far but has taken only 9 of the tests. If each test is out of 30, at least how much Zubeida score in any one of the remaining three tests to still have a chance to match Raghav's performance?

If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be

What is the average of first 30 multiples of 9?

A circle and a square have same area. The ratio of the side of the square to the radius of the circle will be:

If cos4θ-sin4θ=13 then the value of tan2θ is

A can make a cupboard in 10 days and B can do it in 50 days. Along with C, they did the job in 6.25 days only. Then in how many days C alone can do the job?

50 litre mixture of water and alcohol contains 10% alcohol. How much more alcohol must be added to make the strength of alcohol 40% in the new mixture?