Question 201703
Let  s = Sanjay  age,,,b= Brother's  age
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(1) s = (1/2) b
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(2)  ( s+6) = (3/5) (b+6)
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subst  (1) in  (2)
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(1/2) b +6 = (3/5)b + 18/5
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6- 18/5 = (3/5 -1/2) b
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2.4 = .1 b
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24 = b,,,,,,s= 1/2 b = 1/2 *24 = 12
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check
(1) 12 = 1/2 * 24 ,,,,ok
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)2)  12 +6 = (3/5) ( 24 + 6 )
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18 = 3/5 *30 =18 ,,,,,,ok