Random Puzzles 

Workings

Hint
Adults have fewer bones than children.

Answer
Days in a year.

There are usually around 206 bones in an adult human body, and 365 or 366 days in a year.

Workings

Hint
It's not just the vowels that have a problem.

Answer
H, S, and T.

Reasoning
It should read:

"Can you tell what is wrong with this paragraph? At first glance you may think that just the vowels have problems, but no! Three consonants also have problems, they have been replaced with the letter R, but which ones are they?"

Workings

Hint
Look at the lines.

Answer
 


Reasoning
Each letter appears as many times as there are straight lines in that letter.

The letter H has three straight lines, so three H's are shown.

Workings

Hint
The full sequence starts with 3.

Answer
6.

These are the decimal places of π ≈ 3.1415926.