Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What is so fragile that saying its name breaks it?

John was drowned by he was not wet. How?

Which digit occurred maximum times between the number 1 and 1000?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Find the next number in the series.
1 10 24 43 67 ?

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

What is the next number in this matchsticks series riddle?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.