Getting number of rows/columns from csv file in R with condition -

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I have a CCV file, with which I have read with the command: 

  my_data & Lt; There are several columns in it, but I want to get the number of rows, the specific column columns, for example, the number of rows where the column " Value "is 20 more. 
 I've tried:  
  k & lt; -subset (my_data, my_data $ VAL & gt; 24) length (k)   
 but it does not look right. I do not know how it works.   
 
 
  dim (k)  If you have a data frame or  Subset (my_data, my_data $ VAL> 24))

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