Quantitative Aptitude - Arithmetic Ability Questions

A boat is sailing towards a lighthouse of height 20√3 m at a certain speed. The angle of elevation of the top of the lighthouse changes from 30° to 60° in 10 seconds. What is the time taken (in seconds) by the boat to reach the lighthouse from its initial position?

A factory buys 10 machines. 2 Machine­A, 3 Machine­B and rest Machine­C. Prices of the machines are Rs 95000, Rs 60000 and Rs 50000 respectively. What is the average cost of these machines?

A sphere of radius 5 cm is melted to form a cone with base of same radius. The height (in cm) of the cone is

If the angle of elevation of the sun decreases from 45° to 30°, then the length of the shadow of a pillar increases by 60m. The height of the pillar is

If [a + (1/a)]2 – 2[a – (1/a)] = 12, then which of the following is a value of 'a'?

What is the value of tan 4π/3?

Expand and simplify (x + 4)2 + (x -­ 2)2

If x-1x = 10, then find the value of x4+1x2