Direction: In the question generally a set, group or series of numerals is given and you are required to trace out the numerals following certain given conditions.

Richard is 15^th from the front in a column of boys, there were thrice as many behind him as there were in front. How many boys are there between Richard and the 7^th boy from the end of the column? 

Given: Richard is 15th from the front in a column of boys, there were thrice as many behind him as there were in front.

Boys in front of Richard = 14
Boys behind Richard = 14 × 3 = 42 
Total number of boys = 14 + 42 + 1(Richard) = 57

Number of boys between Richard & 7th boy from the end of the column:
⇒57 - (15 + 7)
⇒57 - 22
Answer = 35 boys

Hence, the correct answer is option (3).