2 added 6 characters in body
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IMO There is only one way to make this construction that sounds totally natural

This kind of problem is difficult

The reason is that we are making a statement, not about problems, but about "this kind". In the same way as we might say "this kind of mushroom is poisonous".

"These kinds of problems are difficult" does not sound incorrect per se, but it is less accurate.

These kinds of mushrooms are poisonous.

Which kind is the speaker referring to? All grey ones or those with pointy hats?

NOTE: The other option sounds totally wrong to me:

*This kind of problems

*This kind of apples

*This kind of people

IMO There is only one way to make this construction that sounds totally natural

This kind of problem is difficult

The reason is that we are making a statement, not about problems, but about "this kind". In the same way as we might say "this kind of mushroom is poisonous".

"These kinds of problems are difficult" does not sound incorrect per se, but it is less accurate.

These kinds of mushrooms are poisonous.

Which kind is the speaker referring to? All grey ones or those with pointy hats?

NOTE: The other option sounds totally wrong:

*This kind of problems

*This kind of apples

*This kind of people

IMO There is only one way to make this construction that sounds totally natural

This kind of problem is difficult

The reason is that we are making a statement, not about problems, but about "this kind". In the same way as we might say "this kind of mushroom is poisonous".

"These kinds of problems are difficult" does not sound incorrect per se, but it is less accurate.

These kinds of mushrooms are poisonous.

Which kind is the speaker referring to? All grey ones or those with pointy hats?

NOTE: The other option sounds totally wrong to me:

*This kind of problems

*This kind of apples

*This kind of people

1
source | link

IMO There is only one way to make this construction that sounds totally natural

This kind of problem is difficult

The reason is that we are making a statement, not about problems, but about "this kind". In the same way as we might say "this kind of mushroom is poisonous".

"These kinds of problems are difficult" does not sound incorrect per se, but it is less accurate.

These kinds of mushrooms are poisonous.

Which kind is the speaker referring to? All grey ones or those with pointy hats?

NOTE: The other option sounds totally wrong:

*This kind of problems

*This kind of apples

*This kind of people