Others Maths Puzzle Numerical Ability Simple & Compound Interest

If a sum of money grows to 144/121 times when invested for two years in a scheme where interest is compounded annually, how long will the same sum of money take to tribble if invested at the same rate of interest in a scheme where interest is computed using simple interest method?

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Others Other Question

Present age of abi and nithi are in the ratio 7:8 respectively.Seven years hence this ratio will become 8:9 respectively.What is abi present age in years?
Option
a)40 years
b)38 years
c)48 years
d)35 years
1000student has individual locker. First student opens all lockers and second student closes all even number of lockers . Similarly 3rd students goes to 3rd number of locker like 3 6 9 12 upto 999. similarly forth goes to 4 table number like 4 8 12 16 up to 1000. thus all 1000 students go to their respectively lockers and they open all if they find closeotherwise they close if they find open. So you have to tell that afterlast student how many lockers will open.