Quantitative Aptitude - Arithmetic Ability Questions

If cos(A-B) - cos(A+B) = x, then the value of x is

The difference between the ages of mother and son was 21 when mother's age was 43. If father is elder by 3 years to mother, what will be the difference between the ages of son and father when father attains 50 years?

The difference between the greatest and least five­ digit numbers formed by the digits 2,5,0,6,8 is (repetition of digits are not allowed)

The height of a cone is 24 cm and the area of the base is 154 cm2 . What is the curved surface area (in cm2) of the cone?

The cash difference between the selling price of an article at a profit of 2% and 16% is Rs.3. The ratio of two selling prices is

Which of the following is the correct option for the congruency of the two triangles ABC and PQR as per the SAS congruency criterion?

If the diameter of the two circles is 6 units and 10 units and a centre distance of 8 units. Calculate the number of common tangents that can be drawn to both the circle.

If the standard deviation of a population is 4.5, what would be the population variance?