Replace the question mark with the correct number.

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

Which English verb becomes past tense just by rearranging the letters?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Can you name some countries which do not have the alphabet 'A' in them?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

Make a sentence consisting of three words that have the whole alphabet.

Find the number of squares in the below picture

What has 88 keys?