Quantitative Aptitude - Arithmetic Ability Questions

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The difference between simple and compound interest (compounded annually) on a sum of money for 3 years at 10% per annum is Rs. 93. The sum (in Rs.) is:

What is the value of Sec 30° + Tan 60°?

If tan a = √3 + 2, then the value of tan a - cot a is

If ABCD is a trapezium, AC and BD are the diagonals intersecting each other at point O. Then AC : BD is

Find the number that is as much greater than 39 as is less than 79.

The average marks of 10 students in an examination was 25. It was later found that the marks of one student had been wrongly entered as 34 instead of 43. What is the correct average?

Find the value of '?, if the mean of the data set 18, 16, 22, 13, ? = 16.