The ages of Ruby and Reshma are in the ratio 5:7 , 4 years later, their ages will be in the ratio 3:4 . Find their ratio...
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Age of ruby=5x
Age of reshma=7x
After 4 years
Age of ruby=5x+4
Age of reshma =7x+4
(5x+4)/7x+ 4=3/4
4 (5x+ 4)=3(7x+ 4)
20x+16 =21x+12
16-12=21x-20x
4=X
x=4
Age of ruby = 3 (4 )=12
Age of reshma = 4 ( 4 ) = 16
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