Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

If one-third of one -fourth of a number is 15, then three-tenth of that number is--

A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?

A shopkeeper expects a gain of 22.5% on his cost price. If in a week, his sale was of TK. 392, what was his pr...

An amount of money at simple interest amounts to TK. 815 in 3 years and to TK> 854 in 4 years. The amount is -...

A student loses 1 mark for every wrong answer and scores 2 marks for every correct answer. If he answers all t...

The[ triangular base of a prism is a right triangle of sides a and b = 2a . The height h of the prism is equal...