How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Can you count the number of triangles in the picture below?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

how come the second man dies?

What has 88 keys?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything