How many times does the digit '4' come to write numbers from 1 to 100?

Which of the following is the next number in the series : 2, 4, 3, 9, 4, 16, 5, 25, 6,-------?

A wristwatch was sold at 10% profit. If the cost was 15% less and the selling price was Tk. 20 less, then the...

In a book store, the sales of a book decreased by 80% from 2007 to 2008. If the sales in 2009 were the same as...

Robin has 4 times as many marbles as Azad has and 5 times as many as Kalam has. If Kalam has more than 40 marb...

If x is a positive number, 500% of x is what percent of 500x?

How much longer is required to drive one mile at 60 miles/hour than at 100 miles/hour?