IBPS Government Jobs Exams Numerical Ability Simple & Compound Interest

The simple interest on a certain sum for 2 years at a certain rate of interest is Rs.2000 and compound interest on the same sum, same time and same rate of interest is Rs.2050. Then find the ratio between CI for 2 years and CI for 3 years?
A)820 : 1361 B)820 : 1261 C)1261 : 820 D)1361 : 820 E) None of these

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IBPS Other Question
Present age of Rajeev is 100/3% of his fathers age and his father is half of the age of grandfather of Rajeev. The average of the present ages of all of them is 110/3 years. What was the ratio of their ages 10 years ago?
A)1 : 43 : 56 B)1 : 23 : 56 C)1 : 23 : 46 D)5 : 27 : 16 E)None of these What should come in place of question mark (?) in the following alpha-numeric series ?
C6, F3, I9, ?, O3
A)T6 B)Q3 C)R9 D)L6 E)None of these