A bank offers a 20% compound interest per half year . A customer deposits Rs. 2800 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is______

The ratio in which two sugar solutions of the concentration 25% and 45% are to be mixed to get a solution of concentration 30% is

If α and β are the roots of equation x² - 2x + 4 - 0, then what is the equation whose roots are α³/β² and β³/α²?

If a sailer sails 12 km distance within 5 hours against the flow of a river. If he sails 22 km distance in same time along the flow of the river. Then velocity of the river is _______

Runs scored by Rohit sharma in some 3 test Matches against Pakastian are as follows 101, 126, 32, 38, 52, and 40. Find median of the given scores.

A discount of   $$ 2{1\over 2}\% $$ is given to the customer on the marked price of an article. A man bought the article for Rs.39. The marked price of the article is:

In an election between two candidates, 75% of the voters cast their votes, out of which 2% votes were declared invalid. A candidate got 9261 votes which were 75% of the valid votes. The total number of voters enrolled in that election was: