Quantitative Aptitude - Arithmetic Ability Questions

A solid sphere of diameter 7 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area ?

The sum of a fraction and 3 times its reciprocal is 19/4. What is the fraction?

Coefficient of x2 in (x + 9)(6 -­ 4x) is

The area of a circle is 346.5 cm2. Find its circumference (in cm).

In a circle, a diameter AB and a chord PQ (which is not a diameter) intersect each other at X perpendicularly. If AX : BX = 3 : 2 and the radius of the circle is 5 cm, then the length of chord PQ is

A student multiplied a number by 6/7 instead of 7/6. What is the percentage error in the calculation?

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

Select the related number from the given alternatives.
0.02 : 0.002 :: 1/3 : ?