sentence correction: I have been solving one problem since last monday, now...

English as a Second Language English Vocabulary, Grammar and Idioms
1

HI ,

I told my friend " I have been solving one problem since last monday , now the problelm has come into culmination".

is the above sentence contain any mistakes ?

Regards
Pavan

2

This looks a little weird to me. Does anyone else feel the same about it?

I’d say, "I have been trying to solve a problem since last monday,

Even this looks weird to me. I think you probably want to say that the problem is on the verge of getting solved.

It should be ‘Does the above sentence’, not ‘is the above sentence’