The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The  observation is

A principal increases by 21% over 2 years with compound interest. What will be the simple interest in 4 years at the same interest rate of Rs 1000?

A, B and C contract a work for Rs. 550. Together A and B are to do 7/11 of the work. The share of C should be?

A vertical pole and a vertical tower are standing on the same level ground. Height of the pole is 10 metres. From the top of the pole the angle of elevation of the top of the tower and the angle of depression of the foot of the tower are 60° and 30° respectively. The height of the tower is

The graph of the equations 25x + 75y = 225 and x = 9 meet the point: 

In the given figure , DE‖BC and AD:DB=5:3, then what is the value of DE|BC?

A wholesaler sold a water purifier at a loss of 40%. If the selling price has been increased by Its. 125, then wholesaler will get the profit of 10%. What was the cost price of the purifier?

Profit obtained on selling an article for Rs 540 is equal to the loss incurred on selling the article for Rs 370. if selling price is Rs. 910, Then what is the profit percentage?