A can do a work in 30 days, B can do the same work in 45 days. If they work together for 10 days, how much of the work is left?
Answer: A. 1/3
In 10 days, A does 1/3 of the work and B does 2/9 of the work, totaling 13/27. The remaining work is 1 - 13/27 = 14/27, which simplifies to approximately 1/3.