Task: Question Answering
Input (English): Problem: a company has two models of computers , model x and model y . operating at a constant rate , a model x computer can complete a certain task in 72 minutes and a model y computer can complete the same task in 36 minutes . if the company used the same number of each model of computer to complete the task in 1 minute , how many model x computers were used ? 
Options: a ) 22 , b ) 23 , c ) 24 , d ) 25 , e ) 26
Output (English): c