What should come in place of the question mark '?' in the following number series?

6, 8, 11, 16, 23, ?

A whole number is added to 50 and the same number is subtracted from 50. The sum of the resulting numbers is 

The difference between B a discount of 30% on ₹2,000 and two successive discounts of 25% and 5% on the same amount is 

Find the greatest value of (a + b) such than an 8-digit number 4523a60 b is divisible by 15.

Find the conjugate of (1 + i) ³ 

 if $$\sqrt { 11- 3\sqrt { 8}}=a+b\sqrt { 2}$$, then what is the value of (2a+3b)?

The following pie chart gives the central angles of the sectors representing the number of cameras sold form a shop from July to November in a certain Year.

what percentage are the sales in July of the total sales from July to November

The following bar chart shows the exports (in ₹'0000) of an item from a country 5 consecutive years.

What is the average value of the export of that item from the given country per year?