Random Puzzles 

Workings

Hint
The puzzle contains the question.

Answer
26.

Reasoning
The puzzle reads 'how many letters in this puzzle'.

The puzzle's letters alternate between the top and bottom lines.

Workings

Hint
It's not just the vowels (AEIOU) 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 (AEIOU) have problems, but no! Three consonants also have problems, they have been replaced with the letter R, but which ones are they?"

Workings

Hint
Tomorrow's yesterday is always today.

Answer
Today.

Reasoning
Tomorrow's yesterday is always today.

And yesterday's tomorrow is also always today.

Workings

Hint
helium = h-- + l--

Answers
helium = hum + lie latest = let + sat almond = man + old eldest = led + set placed = cap + led radium = air + mud desert = red + set wealth = law + the tricky = cry + kit funnel = elf + nun
Alternative Answers
The following answers use less common words.

helium = him + leu
helium = hue + mil
helium = hum + lei

latest = els + tat

almond = don + lam
almond = lam + nod

eldest = eld + set
eldest = els + ted

placed = pec + lad

radium = mud + ria
radium = amu + rid
radium = aid + rum

wealth = awl + the
wealth = haw + let

There are more answers with even rarer words, but I've chosen not to include those.