Do You See It?

What is the next number in this matchsticks series riddle?

Find the next number in the series below

21 32 54 87 131 ?

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 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What number comes next in the series?

5 15 5 18 5 24 14 20 _