A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Can you arrange the six given marbles in a manner that each one of them is touching all four marbles of different colours?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What does this rebus picture identify?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What work can one never finish?

Solve the equation in the image by looking at the pattern closely.

There are two arch enemies Messi and Ronaldo who hate each other to an extreme. One day both were going together and a Jeanie appeared in front of them. Jeanie grants 3 wishes to Ronaldo and one to Messi.

Messi replied smartly 'Give me twice whatever Ronaldo demands'.

Ronaldo asked his 1st wish 'Give me 10000 billion dollars. Soon Messi gets 2000 billion dollars.
Ronaldo asked for his 2nd wish 'Give me one mansion in every country in the world. Soon Messi gets two mansions in every country of the world?

What should be Ronaldo's third wish?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209