Others Maths Puzzle

A and B together can complete a task in 20 days. B and C together can
complete the same task in 30 days. A and C together can complete the same task in 30 days. What is the respective ratio of the number of days taken by A when completing the same task alone to the number of days taken by C when completing the same task alone?

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Others Other Question

You have three bags, each containing two marbles. Bag A contains two white marbles, Bag B contains two black marbles, and Bag C contains one white marble and one black marble. You pick a random bag and take out one marble. It is a white marble. What is the probability that the remaining marble from the same bag is also white? A+B+C+D = D+E+F+G = G+H+I = 17 AND A=4 AND ALL THE VALUES OF A TO I LIE BETWEEN 1 TO 9. THEN FIND OUT THE WHAT IS THE VALUE OF THE D AND G?