Quantitative Aptitude - Arithmetic Ability Questions

In ΔABC, ∠BAC = 90° and AD is drawn perpendicular to BC. If BD = 7 cm and CD = 28 cm, then what is the length (in cm) of AD?

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?

5% more is gained by selling a watch for Rs. 350 than by selling it for Rs. 340. The cost price of the watch is

Which of the following is correct?

Rs. x invested at 9% simple interest per annum for 5 years yields the same interest as that on Rs. y invested at 6.25% simple interest per annum for 8 years. Find x:y.

In what ratio rice costing Rs 14/kg mixed with another rice costing Rs 11/kg to get the mixture costing Rs 11.6/kg?

Find the range of the data : 11,13, 9, 17, 13, 19, 10, 11

What is the third proportional to 10 and 20?