Exam Maths Puzzle Numerical Ability

Actually i am not remembering qus. exactly but it is look like this--
x is any number system like binary number system 0 and 1 allow, where x represents only 1 and z is the decimal representation of that x, so what is the value of z=?
option 1)-121 2)-11111 c)-both d)-none....reply

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Exam Other Question

Q. Three persons A,B,C whose salary together amounts to Rs 1440, they spend 80%, 85% and 75% of their salaries respectively; if their savings are at 8:9:20 then find the salary of B? 2 9 30 105 ? 2195