Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159

If a shopkeeper buys 2 oranges for Rs.5 and sells 3 for Rs.7 only, then what percentage of loss and loss did he gain?

Find the greatest value of k for which the 6-digit number 24312k is divisible by 6.

The sum of the two - digit number is 6 and the number and its flip (digits written in reverse order) both are multiples of 3. If the difference between them is 36, then which of the following is the required number and its flip? 

The total number of digits used in numbering the pages of a book of 366 pages is

If 30% of a = b, then b% of 50 is the same as:

Three different containers contain 130 liter, 442 liter and 234 liter of milk, respectively. What biggest measure can be used to measure all the containers exactly?

Find the solution of 5x-7=12?