Task: Question Answering
Input (English): Problem: a company has two models of computers , model m and model n . operating at a constant rate , a model m computer can complete a certain task in 36 minutes and a model n computer can complete the same task in 18 minutes . if the company used the same number of each model of computer to complete the task in 1 minute , how many model m computers were used ? 
Options: a ) 12 , b ) 11 , c ) 10 , d ) 9 , e ) 8
Output (English): a