A box of candy contains two types of chocolates. One type is made with nuts, and the other type is nut free. The box contains 6 times more candies with nuts than candies without nuts. Johnny pulls a candy out of the box at random. What is the probability that Johnny pulled out a candy without nuts?
With out nuts = w
with nuts = 6w
total candies = w + 6w = 7w
prob = w out of 7w = w/7w = 1/7