Wen Wen and her sister have 50 books altogether. If my sister sends 10 books to Wenwen, the number of books will be 2 less than Wenwen.

My sister originally distributed 34 copies, and Wenwen has 16 copies. '

Suppose my sister has X books and Wenwen has Y books.

x+y=50 → x+y=50

x- 10 = y+ 10-2→x = y+ 18

From this we get that y+ 18+y=50.

2 y=32

y= 16

So x=50- 16=34.