A man is running in a marathon. It takes him 2 seconds to cover 3m. After every 2 seconds the winds throws the man 1m back.How much time will it take him to cover 148.65m?
A bag has 25 blue balls and 25 red balls. You pick a ball and throw it out. What is the probability that you will pick out a blue ball after there are 43 balls left ?
A puppy sleeps in the middle of his bed. His height quadruples each day. In 20 days his height will be the same as the length of the bed. What will be the height of the puppy in 10 days ?