Task: Question Answering
Input (English): Problem: my grandson is about as many days as my son in weeks , and my grandson is as many months as i am in years . my grandson , my son and i together are 140 years . can you tell me my age in years ? 
Options: a ) 80 , b ) 90 , c ) 85 , d ) 84 , e ) 89
Output (English): d