Sabbir has a brother one - fourth of his age and a sister two times of his age. If the combined age of all the three siblings is twenty more thrice the age of the youngest, how old is Shabbir's sister?
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Answer:
Sabbir = X
Brother = X/4 (youngest among 3)
Sister = 2X
now,
X + 2X + X/4 - 20 = 3X /4
when we solve, we get X = 8
now age of sister is 2X = 16 years
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