The task is to generate the correct answer for a given math problem.

[Q]: Problem: ( 935421 x 625 ) = ?
[A]: 584638125

[Q]: Problem: from a pack of cards , two cards are drawn one after the other , with replacement . what is the probability that the first card is a black card and the second card is a king ?
[A]: 1 / 26

[Q]: Problem: after replacing an old member by a new member , it was found that the average age of 5 members of a club is the same as it was 3 years ago . what is the difference between the ages of the replaced and the new member ?
[A]:
15