Mary is twice as likely to randomly pick a blue marble from a bag as she is to pick a red marble.?

Mary is twice as likely to randomly pick a blue marble from a bag as she is to pick a red marble.If there are x red marbles and the bag contains 40 marbles, whis is the probability that Mary will pick a blue marble from the bag? a. 16/40 b. x/10 c. x/20 d. x/40 e. 40-x/40 please answer and explain