There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Can you solve the rebus below?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?