How many times can you subtract the number two from the number fifty?

In the image given, you can find several triangles. Can you count them all?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What number divided by 4 is the same as that number minus 4?

Find the next number in the sequence

5 12 24 36 ?

What has 88 keys?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

If,

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

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

D + F = ?