Seven boxes A, B, C, D, E, F and G are kept one over the other, but not necessarily in the same order. D is kept third from the bottom. Only one box is kept between C and D. Only three boxes are kept between B and F. B is kept at one of the positions above F. A is kept immediately below G. How many boxes are kept between D and E?
Three chairs and two tables cost Rs 7,000 and five chairs and three tables cost Rs 11,000. What is the cost of four chairs and two tables?