What does this rebus riddle means ?

Find the next number in the series below

21 32 54 87 131 ?

What jumps when it walks and sits when it stands?

Replace the question mark with the correct number below.

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

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

Who always enjoys poor health?