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 have problems, but no! Three consonants also have problems, they have been replaced with the letter R, but which ones are they?"
?
Puzzle 198
Kevin wants to go and see his brother, who lives across the valley, and he wants to take his three pets with him, a dog, a cat, and a mouse.
However, the shortest way to his brother's house involves a river crossing, and Kevin only has a very small boat that can carry him and just one of his pets.
He doesn't want to leave the dog alone with the cat, nor does he want to leave the cat alone with the mouse. However, the dog and mouse are great friends.
How can Kevin cross the river to see his brother, and make sure his pets are all happy?
My first is in horse, but not in pony.
My second is in coyote, but not in jackal.
My third is in shrew, and also in vole.
My fourth is in panda, but not in bear.
My last is in baboon, but not in monkey.
What am I?
Reasoning
The 1st letter can be: H R S E
The 2nd letter can be: O Y T E
The 3rd letter can be: E
The 4th letter can be: P N D
The 5th letter can be: B A