A student loses I mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?

There are two stations of length 162 meters and 120 meters respectively . A train takes 15 seconds to pass fir...

A man rows a certain distance along the stream and against the stream in 1 hour and 1.5 hours respectively . I...

A milkman pays tk. 6.40 per liter of milk. He adds water and sells the mixture at tk. 8per liter. By doing thi...

A leading library charges c cents for the first week that a book is loaned and f cents for each day over one w...

Find the compound interest at the rate of 10% per annum for four yearss on the principal which in four years a...

A wheel rotates 10 times per minutes and moves 20 m during each rotation . How many feet does the wheel move i...