In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Using Only Five 5's and any mathematical operator make sum as 37

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

How is a fly different from a mosquito?

what does the below rebus mean?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?