Question Details

Question No: 21

Each of two boxes contains both black and white marbles, and the total number of marbles in the two boxes is 25. One marble is taken out of each box randomly. The probability that both marbles are black is 27/50, and the probability that both marbles are white is m/n, where m and n are relatively prime positive integers. What is m + n?

Answer must be a floating-point or integer value and precision error less than 10^-6 is allowed.