(1a) A lot of students have asked Professor Brown how to solve the most difficult physics problem in the textbook. So, he will show the solution next class. (my example)

(1b) A lot of students have been asking Professor Brown how to solve the most difficult physics problem in the textbook. So, he will show the solution next class. (my friend's revision)

(2a)  A lot of people have been asking me how old I am. I don't want to tell them. (my example)

(2b) A lot of people have asked me how old I am. I don't want to tell them. (my friends' revision)

I don't understand when to use the present perfect and present perfect continuous in these contexts. Please help me. Thank you very much for your help and time.

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