Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the missing number from the given series.34, 69, 140, 283, ?, 1145

A sum becomes Rs 1392 in 2 years and Rs 1488 in 3 years at simple interest. What is the rate (in percentage) of interest per annum?

A sum of Rs 800 becomes Rs 1000 in 2 years at simple interest. What is the per annum rate of interest (in percent)?

If (-1/2) * ( x - 5) + 3 = -5/2, then what is the value of x?

When a number is increased by 26, it becomes 113% of itself. What is the number?

Find the odd numbers/letters/numbers from the given alternatives.

Select the odd number from the given alternatives.

The standard deviation of the set {10, 11, 12, 9, 8} is