How many triangles can you find in this given picture?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

What is the word or phrase?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

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

Which English verb becomes past tense just by rearranging the letters?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Why is the Hole below a Lock?