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Q 2264101055.     The ratio of the ages of A and B `7` yr ago was `3: 4`
respectively. The ratio of their ages `9` yr from now will be
`7 :8` respetively. What is B's age at present?
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)