Can you fill the blank with the correct number?

6 30 870 756030 _____

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Can you find the hidden animal in the picture below?

What does does this rebus picture means ?

Spot what is wrong here in below Picture?

What has one eye, but can’t see?

Can you place six X (crosses) in below board without making three in a row in any way ?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Next Number in the Series,

5, 16, 49, 104, ?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?