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?

Which five letter word can be added at the end of below word to form a
valid word?

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How many words can a pen with half refill write?

What part of Turkey has the most feathers?

What goes up but never comes down?

Count the Triangle in the figure given below:

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

How many triangles are there on the puzzle below?

How can you write nineteen in a manner that if we take out one, it becomes twenty?