If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

How many times can you subtract the number 5 from 25?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Solve the counting riddle by identifying the number of triangles in the given picture.

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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