Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd letter/letters from the given alternatives.

The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?

What least number must be added to 213, so that the sum is completely divisible by 9?

Of the 3 numbers whose average is 64, the first number is 1/3 times the sum of other 2. The first number is

If tan (5x ­- 10°) = cot (5y + 20°), then the value of x + y is

In which of the following quadrilaterals opposite angles are supplementary?

The radius of a hemisphere is 21 cm, what is its volume? (Take π = 22/7)

The total surface area of a hemisphere is 462 sq.cm. Find its diameter (in cm).