Task: Question Answering
Input (English): Problem: at 1 : 00 pm , there were 10.0 grams of bacteria . the bacteria increased to x grams at 4 : 00 pm , and 19.6 grams at 7 : 00 pm . if the amount of bacteria present increased by the same fraction during each of the 3 - hour periods , how many grams of bacteria were present at 4 : 00 pm ? 
Options: a ) 13.7 , b ) 14.0 , c ) 14.3 , d ) 14.6 , e ) 14.9
Output (English): b