Navjyot ranks 15th from the bottom and 19th from the top in his class. How many students are there in his class?

Five female models—Divya, Farida, Lakshmi, Meera, and Sita—walked on the ramp in increasing order of their height. The shortest walked first and the tallest walked last. Sita is shorter than Divya. Neither Farida nor Meera was the first to walk. Sita's height was 175 cm and she was the fourth model to walk. Farida walked earlier than Meera. Who among them is the second shortest model?

Six identical notebooks of different subjects Physics, Biology, Hindi, Geography, Chemistry, and Mathematics are arranged one over the other in the following manner: only three notebooks are kept between Chemistry and Physics notebooks. Only Biology notebook is kept between Mathematics and Geography notebook. Hindi notebook is kept at the bottom-most position. Notebook of which subject is kept at the third position from the top?