The ratio of age of vivek and his sister is 3:4. If the age of his sister is 28 years, How old is vivek?
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Answer: Let the age of Vivek =x yrs.
and Age of Amit =y yrs.
According to question,
x+y=47 and
xy=550
Now,
(47−y)y=550
⇒47y−y
2
=550
⇒y
2
−47y+550=0
⇒(y−22)(y−25)=0
⇒y=22 or y=25
Since, Amit is younger brother, age of Amit =22 yrs.
And Age of Vivek =25 yrs.
Step-by-step explanation:
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