If the curved surface area of a right circular cone is 10010 sq cm and its slant height is 91 cm, find its total surface area.

A rises from his house at 12 noon towards B’s house at a speed of 8 km/hour. After 1 hour, B rides from his house towards A’s at a speed of 7 km/hour. If the distance between the two houses is 68 km, the time when they meet is

simplify the following equation
$$ (1-{1\over3})(1-{1\over4})(1-{1\over5})......(1-{1\over n})$$

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to

A batsman scores 98 run in the 17^th match of his career. His average runs per match increased by 2.5. What is his average before the 17^th match?

A boat goes downstream in one-third the time it takes to go upstream. Then the ratio between the speed of boat in still water and speed of the stream is

If a discount of 10% is allowed on the marked price of an article, a shopkeeper gets a profit of 25 %. If he offers a discount of 25% on the marked price of the same article, then his percentage profit/loss will be:

A spherical ball of lead 3 cm in diameter is melted and recast into three spherical balls The diameter of two of these are 1.5 cm and 2 cm respectively. The diameter of the third ball is