Question

A box contains 12 balls of which some are red in colour. If 6 more red balls are balls are put in the box and a ball is drawn at random, the probability of drawing a red ball double than what it was before. Find the number of red balls in the bag.

Answer 1

there are 10 red ball in a box

Answer 2

3red balls are there excluding 6 red balls which were added later.