Quantitative Aptitude - Arithmetic Ability Questions

A and B together can finish a work in 30 days. They worked for it for 20 days and then B left the work. The remaining work was done by A alone in 20 days more. In how many days can A alone finish the work?

5.16 x 3.2 =

From the top of a platform, the angle of elevation of a tower was 30 deg. The tower was 45 mts high and the horizontal distance between the platform and the tower was 40√3 m. What was the height of the platform?

A shuttle cock used for playing badminton has the shape of a frustum of a cone mounted on a hemisphere. The external diameters of the frustum are 5cm and 2cm, the height of the entire shuttle cock is 7cm. Find the external surface area.

Find the in-radius (in cm) of an equilateral triangle whose sides are 6 cm each.

25 - 1/2{5 + 4 - (3 + 2 - 1 + 3)} = ?

0.196 + 1.96 + 19.6 + 196 = ?

If 12x2 - ax + 7 = ax2 + 9x + 3 has only one (repeated) solution, then the positive integral solution of a is