Each of the digits in the number 7148356 is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?

N is shorter than L, but taller than O. M is taller than N but shorter than L. L is not as tall as K. Who is in the middle based on height?

Six vendors A, B, C, D, E and F sell the same items in the market. Only three vendors sold less items than F. A sold more items than C. E did not sell the most items. D sold more items than C and A, but less than F. If B sold 20 items, then what can be the number of items sold by E?

Pranay ranked 14th from the top and 44th from the bottom in his class. How many students are there in his class?

Nikhil ranked 18th from the top and 36th from the bottom in his class. How many students are there in his class?

Niku ranked 24th from the top and 13th from the bottom in his class. How many students are there in his class?

Shikhar ranked 38th from the top and 24th from the bottom in his class. How many students are there in his class?

In a row of 49 students facing north, Ankur is 19th from the right end. If Tinu is 11th to the left of Ankur, what is Tinu's position from the left end of the line?

Prashant ranked 11th from the bottom and 23th from the top in his class. How many students are there in his class?

Among five people of different ages, P is older than R. L is younger than M. R is older than Y. M is younger than Y. Who is the youngest?

A, B, C,  D and E have different ages. C is older than B but younger than D. Only one person is younger than A. B is not the youngest. Who amongst them is the second oldest?