Task: Question Answering
Input (English): Problem: a certain bag contains 60 balls — 22 white , 18 green , 2 yellow , 15 red , and 3 purple . if a ball is to be chosen at random , what is the probability that the ball will be neither red nor purple ? 
Options: a ) 0.7 , b ) 0.15 , c ) 0.54 , d ) 0.85 , e ) 0.91
Output (English): a