GRE Exam Numerical Ability Arithmetic

if a computer with hardrive cost 2900 rs and computer without hardrive cost 1950 rs alone more than hardrive.what is cost of harddrive.

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GRE Other Question

1,2,2,4,4,4,4,8,8,8,8,...... what is the 1025th term of the sequence IN a class of 15 students 7 read latin,8 read greeks,3 not either.how many of them read both latin and greek?