To decorate a cake, you make a shade of purple icing using 12 drops of red food coloring for every 18 drops of blue. How many drops of blue food coloring would you need if you use 6 drops of red food coloring?

Aclothing store has just advertised at a bargain price, that a customer tries on a t-shirt is 0.40. a new range of t-shirts. the probability if a customer tries a t-shirt, the probability that they will buy it is 0.70 while if a customer does not try on a t-shirt, the probability that they will buy it is 0.15. a customer has just bought a t-shirt. find the probability that the customer did not try on the t- shirt.