In a gathering of 8 friends, each person shakes hands with every other person exactly once. How many handshakes will take place?

If &m& is an integer such that &m& divided by 5 leaves a remainder of 2, what is the remainder when $3m$ is divided by 5?

If 25 years are subtracted from B's age, we obtain his father's age. If his father's age is 45 years, then the age of B is

Insert the missing number 1234, 2345, ______, 4567, 5678,

Select the pair that best expresses a relationship similar to Rubber : Elastic

A man age is 5 times his sons. In 21 years it will double that of his sons how old is the son now?

A box with a square base and open top is to have a volume of 4 cubic dm. Find the dimensions of the box, which will require the least material.

To pave a garden path, rectangular paving stones measuring 40cm by 20cm are used. If the path is 25m long and 1.8m wide, how many paving stones are needed?

Mr. Ali contains Rs. 28.50. This money consist of equal number of 5 paisa, 10 paisa, 25 paisa, 50 paisa, and one rupee coins. What is the total number of coins.

What is the unit digit of $8^{12}$ =?

If the length of a rectangle is decreased by 15% while the width remains constant, the resulting area is what percent of the original area?

If is now Jul, what month will it be 100 month from now?

If the largest three-digit number is added to the smallest four-digit number, what is the resulting figure?

Pipe X can fill a swimming pool in 10 hours, and Pipe Y can fill the same pool in 15 hours. If both pipes are opened simultaneously, how many hours will it take to fill the pool?

The average age of a group persons is 16 years. 20 new persons with the average agew of 15 years join the group due to which their average age income 15.5 years. What is the number of persons in the beginning.