Quantitative Aptitude - Arithmetic Ability Questions

The total surface area of a hemisphere is 462 sq cm, what is its curved surface area? (Take π = 22/7)

D and E are points on side AB and AC of ΔABC. DE is parallel to BC. If AD:DB = 2:5 and area of ΔABC is 98 cm sq, what is the area (in sq cm) of quadrilateral BDEC?

The length of one side and the diagonal of a rectangle are 7 cm and 25 cm respectively. Find its area (in cm²)

If x + y + z = 0, then what is the value of (3y2 + x2 + z2 )/(2y2 – xz)?

Find the mean proportional between 2 and 98?

Find the unit digit in the given product (4211)102 x (361)52.

If 4(2x + 3) > 5 -­ x and 5x - ­3(2x­ - 7) > 3x -­ 1, then x can take which of the following values?

The angle of elevation of the top of a tower from a point A on the ground is 30°. On moving a distance of 20 metres towards the foot of the tower to a point B, the angle of elevation increases to 60°. The height of the tower in meters is