Raman ranks sixteenth from the top and forty-ninth from the bottom in a class. How many students are there in the class?

Thirty-six vehicles are parked in a parking lot in a single row. After the first car,there is one scooter. After the second car,there are two scooters. After the third car,there are three scooters,and so on. Work out the number of scooters in the second half of the row.

$A$ bus for Delhi leaves every thirty minutes from a bus stand. An enquiry clerk told a passenger that the bus had already left ten minutes ago and the next bus will leave at $9:35 \,a.m.$ At what time did the enquiry clerk give this information to the passenger?

Manoj and Sachin are ranked seventh and eleventh respectively from the top in a class of $31$ students. What will be their respective ranks from the bottom in the class?

In a row of girls,Rita and Monika occupy the ninth place from the right end and tenth place from the left end,respectively. If they interchange their places,Rita and Monika occupy seventeenth place from the right and eighteenth place from the left,respectively. How many girls are there in the row?

Standing on a platform,Amit told Sunita that Aligarh was more than ten kilometres but less than fifteen kilometres from there. Sunita knew that it was more than twelve but less than fourteen kilometres from there. If both of them were correct,which of the following could be the distance of Aligarh from the platform (in $km$)?