the ratio of ages of sonu and monu is 5:7. Four years later the ratio of their ages will be 3:4. find predent ages
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let the age be 5x and 7x
5x+4/7x+4=3/4
4(5x+4)=3(7x+4)
20x+16=21x+12
21x-20x=16-12
x=4
5x+4/7x+4=3/4
4(5x+4)=3(7x+4)
20x+16=21x+12
21x-20x=16-12
x=4
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