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

[Q]: Problem: a and b can do a work in 5 days and 10 days respectively . a starts the work and b joins him after 2 days . in how many days can they complete the remaining work ?
[A]: 2


[Q]: Problem: a bag contains 12 red marbles . if someone were to remove 2 marbles from the bag , one at a time , and replace the first marble after it was removed , the probability that neither marble would be red is 25 / 36 . how many marbles are in the bag ?
[A]: 48


[Q]: Problem: if | 20 x - 10 | = 130 , then find the product of the values of x ?
[A]:
- 42