Quantitative Aptitude - Arithmetic Ability Questions

ΔABC is right angled at B. BD is an altitude. AD = 3 cm and DC = 9 cm. What is the value of AB (in cm)?

If the average age of four children is 12 years and the average age of these children and their fathers is 20 years, what is the age of the father?

For what value of 'y', x2 + 112x + y2 is a perfect square?

Present age of Amit is twice of Baman’s present age. After 5 years Baman’s age will be 4 times of the Chetan’s present age. If Chetan celebrated his sixth birthday 7 years ago, then what will be the present age (in years) of Amit?

A factory buys 10 machines. 1 Machine­A, 4 Machine­B and rest Machine­C. Prices of the machines are Rs 90000, Rs 40000 and Rs 40000 respectively. Calculate the average cost of these machines?

7 litres mixture of milk and water contains 30% water. 3.5 litres of milk is added to this mixture. What is the percentage of water in the new mixture?

An object travels 24 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?

If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?