Mohan, a shopkeeper, bought a shirt of list price ₹225 at a discount of 20%. If he wants a profit of 30% then he should sell the shirt for:

Two pipes P and Q can fill a cistern in 36 and 48 minutes respectively. Both pipes are opened together, after how many minutes should Q be turned off,so that the cistern be fill in 24 minutes?

Two friends A and B invest in a business in partnership. B borrows 20% of A’s salary, combines it with 60% of his salary and invests with A, who puts all of his remaining salary. One year later the ratio of profit of A and B is 5 : 3 respectively and B returns Rs. 21000 to A which he borrowed from him. What is the difference between salary of A and B?

In how many ways can a committee schedule three speakers for three different meetings if they are all available on any of five possible dates?

The average age of x and y is 18 years. If z is equal to 9 years the average of x, y and z is -

By selling a table for Rs. 350 instead of Rs. 400, loss percent increases by 5%. The cost price of table is : 

A vessel contain some litres of pure milk. If 25 litre of water is added to the vessel, then ratio between milk and water becomes 12:5, 17 litres of mixture is drawn from the vessel and 10 litre of water is added to the mixture. Find the new ratio between milk and water.