Arun and Amit can do a piece of work in 9 days and 12 days respectively. If they work for alternate days and Amit starts the work first, then in how many days 35/36 parts of whole work will be completed?

If the speed of the boat in still water is 20 km / h and the speed of the stream is 5 km / h, then how long will it take for the ferry to travel 100 km with the speed of the stream?

When the integer n is divided by 7, the remainder is 3. What is the remainder if 5n divided by 7?

A can built a wall in 8 days while B can destroy the same wall in 3 days. A start the work and worked for 6 days, during the last 2 days of which B also joins him. In how many days A can finish the remaining work alone?

In a group of 15 women, 7 have nose studs, 8 have ear rings and 3 have neither. How many of these have both nose studs and ear rings? 

The average of 8 readings is 24.3, out of which the average of the first two is 18.5 and that of next three is 21.2. If the sixth reading is 3 less than seventh and 8 less than eight, what is the sixth reading? 

Abdul prepared 42 litres of medicine and filled it in bottles of 280 ml each. Find how many bottle would be required?

The arithmetic mean of the following data is .

23, 17,20,19,21