3.6 Is Billy left-handed or right-handed?

Billy is left-handed.  He writes with his left hand.  However, he plays the 
guitar as if he was right-handed.  This is because he felt that it was silly to 
have his weak hand doing the tough fret-work. Another reason is that when Billy 
and his father went to buy a guitar, Billy asked which was more common.  He 
went with a right-handed guitar.