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2015-03-09T22:22:03+05:30

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The equation goes like this......
first cross multiply a/9x9/20 where u'll get a/20
next cross multiplying a/20x4/9 will result a/45 
now u'll  have a/45=1/9 which simply will end up again cross multiplying 9a=45
and then u'll get a=45/9
                         = 5
Hope it helped .... :) !!

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2015-03-10T09:00:30+05:30

a/9*9/20= a/20
a/20x4/9= a/45 
a/45=1/9

a=1/9*45=5
a=5
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