Diptarka learns swimming once a week. Let's calculate how many days he goes for swimming in 354 days.

In each day how many sperms are formed?

Sitara Begam had 60 guavas in her shop. She sold frac(1)(4) th part of the number of guavas she had. Let's calculate how many guavas are left with her.

Mary and David can do a work individually in 10 days and 15 days respectively. At first Mary alone worked for 4 days, then David alone worked for 5 days and left. Maria came and completed the remaining work in 4 days. If Mary, David and Maria would work together. let’s calculate in how many days they would complete the work.

In a ship, there were stored food for 50 sailors for 16 days. After 10 days 10 more saliors joined them. Let's find, for how many days the remaining food would last.

1st June of 2008 is Tuesday. Let's calculate which day was 1st June of 2006.

Tea vendor Gopal needs 55 litre milk every day. Lets calculate in kl the amount of milk he needs in a week.

If a simple pendulum of length 100 cm is used as a seconds pendulum, then how many seconds will it go slow or fast in a day?

A wheel turns 55 times to cover distance of 77 m. Let's calculate, how many revolution the whell will take to cover a distance of 98 m.

A fair coin is tossed four times, and a person win Re 1 for each head and lose Rs 1.50 for each tail that turns up. From the sample space calculate how many different amounts of money you can have after four tosed once. Find the probability of getting.

6 persons can complete a work in 7 days. Let's find how many persons will be required to finish the work in 21 days. In matheatical language, the problem may be stated as