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Q.

  If a and b vary inversely such that   a1=20, b1=8  and a2=10, then b2=   

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a

16 

b

12 

c

8            

d

4 

answer is C.

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Detailed Solution

 

aα 1 b

a 1 b 1 = a 2 b 2

a 1 =20, a 2 =10, b 1 =8, b 2 =?

20×8=10× b 2

b 2 =2×8=16

 
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