Quantitative Aptitude Practice #4

Two pipes A and B fill a tank in 20 and 30 minutes respectively. If both pipes are opened at once, after how much time should A be closed so that the tank is filled in 15 minutes?

The price of a watch was Rs 12,000 in 2001. But due to devaluation of rupee it became Rs 15,000. What is the % increase in the price of the watch?

84% of a particular total is 714. What is the 92% of the total?

A shopkeeper bought a watch for Rs 200 and sold it for Rs 250. What is the profit %?

Sanjay gives a discount of 15% on the marked price and in the process makes a profit of 19%. By what % did he mark the product over the cost price?