Can you start the fire using two pieces of wood?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

what does this picture(rebus) riddle means ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

A pet show was happening in my locality. I went down along with my kids. In that show, I noticed that all except two of the entries were cats. All except two were dogs and all except two were Monkeys.

Can you find out how many of each animals were present in that pet show?

How many triangles are there on the puzzle below?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?