In a row of children facing north, Neeta is fifteenth from the left end of the row. If she is shifted towards the right end of the row by four places, she becomes eighth from the right end. How many children are there in the row

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M,T,D,F, H, R and W are seven students studying in three different colleges I, II and III with at least two in each college. Each of them has a favourite subject from English, History, Geography, Mathematics, Physics, Chemistry and Biology, not necessarily in the same order.

D’s favourite subject is Physics and studies in college II with only M. H does not study in college II and he likes English. F studies in college III and does not like Mathematics. Those who like Geography and Chemistry study in the same college. W likes Biology and does not study in college I. R does not study with H. R does not like Chemistry. M does not like History.