Task: Question Answering
Input (English): Problem: an optometrist charges $ 150 per pair for soft contact lenses and $ 85 per pair for hard contact lenses . last week she sold 5 more pairs of soft lenses than hard lenses . if her total sales for pairs of contact lenses last week were $ 1455 , what was the total number of pairs of contact lenses that she sold ? 
Options: a ) 11 , b ) 13 , c ) 15 , d ) 17 , e ) 19
Output (English): a