Bratin is now 18 years old, whereas his cousin is 7 years old. After how many years will Bratin's age be 1.5 times that of his cousin?
bratin's age =18 and his cousin =7,
after x year Bratin's age will be 1.5 times that of his cousin
(18+x) =1.5 (7+x)
x=15,
Hence option 'a' is correct.
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