Infosys Company Numerical Ability Ratio and Proportion

Age of a person increased by 10% from last year. What is the current ratio from last year.

a.1:10
b.11:10
c.11:12

Which one is correct?

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Infosys Other Question
Ten boxes are there. Each ball weighs 100 gms. One ball is weighing 90 gms.
i) If there are 3 balls (n=3) in each box, how many times will it take to find 90 gms ball?
ii) with n=10
iii) with n=9 Sum of three consecutive nos is
A)10
B)22
C)25
D)30
E)40