Complete the series 2, 10, 45, 231, 1393, ………………

If the price of rice increases by 20% and a person reduces its consumption by 20%, by what percentage will his total expenditure on rice decrease?

If the mean proportional of A and 27 is 18, then find the value of A.

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.

A person walks at a speed of 3 km/hr and reaches a destination in 7 hours. If the person increases the speed by 1 km/hr, how much earlier will they reach the destination

A person walks at a speed of 2 km/hr and reaches a destination in 4 hours. If the person increases the speed by 3 km/hr, how much earlier will they reach the destination?

Nine identical cubes, each with edge 3 cm, are joined in a straight line to form a cuboid. What is the total surface area (in cm²) of the resulting cuboid?

The number of prime numbers lying between 323 and 332 is:

The curved surface area of a cylinder having radius 5 cm and height 23 cm is:

A 266 m long train passes through a 559 m long tunnel in 66 sec. Find the speed of the train.

If the price of rice increases by 20% and a person reduces its consumption by 20%, by what percentage will his total expenditure on rice decrease?